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Methane - Definition, Uses, Formula, Properties & FAQs

Methane - Definition, Uses, Formula, Properties & FAQs

Edited By Team Careers360 | Updated on Jul 02, 2025 04:36 PM IST

What is methane?

Methane meaning is lighter than saturated hydrocarbons with the chemical formula CH4. It contains four hydrogen atoms and one carbon atom and is the simplest alkane. When natural methane reaches the surface of the air it is called atmospheric methane and can be found under the sea and underground. It is odorless or odorless and is colorless. It is a flammable toxic gas. It is a tetrahedral molecule with four equal CH-bonds. It is produced by colonic anaerobes. Italian scientist Alessandro Volta was the first to scientifically identify methane in 1776.

This Story also Contains
  1. What is methane?
  2. CH4 Methane
  3. Use of Methane
  4. Methane formula
  5. Chemical properties of methane
  6. Locking of Methane Frequency
  7. Chlorophenyl Methane

Methane Features

Methane is one of the most important heat borne diseases and about 70% of methane emissions are linked to human activities. Pure methane is a powerful energy-efficient stock of 55.7 MJ / kg and is used to generate electricity, heating and household cooking

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Background wave

CH4 Methane

Weight / Molar Mass of methane is16.04 g / mol

Maximum 0.656 kg / m³

Methane boiling point of methane is −161.50 ° C

Melting point of methane is−182.5 ° C

Use of Methane

  • It is used in cars, in the oven and in a water heater such as gasoline
  • It is also used to produce electricity
  • It is used as rocket fuel in its refined form
  • It is used as an ingredient in industrial cold prevention
  • It is a common ingredient in fertilizer
  • Used for cleaning products
  • It is used in power stations
  • Used by gas cooks
  • It is used to test electrical equipment

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NEET Highest Scoring Chapters & Topics
This ebook serves as a valuable study guide for NEET exams, specifically designed to assist students in light of recent changes and the removal of certain topics from the NEET exam.
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Methane formula

Methane formula is one of the simplest and easiest formulas given in biological chemistry. The structural and chemical formula of methane is given and described below. Methane is the main source of natural gas and is also known as "marsh gas" or "methyl hydride".

Methane chemical formula

Methane is one of the simplest alkane and it has a carbon atom with 4 hydrogen atoms. Therefore, the chemical formula of methane is provided by

Methane chemical formula: CH4

Methane Structural Formula

Methane is a very simple compound with a molecular weight of 16.043 g / mol. Its molecule consists of a tetrahedral structure consisting of 4 hydrogen atoms bound by 1 carbon atom. Methane is a flammable and colorless gas that occurs naturally in nature. It is heavier than air and is widely used in home ovens, industrial propellers, rocket fuel, gas cookers, fertilizers, other fuels such as cars, water heaters, etc.

Chemical properties of methane

Methane is lighter than wind, with a gravitational force of 0.554. It dissolves slowly in water. It burns easily in the air, forming carbon dioxide and water vapor; the flames are pale, light, and extremely hot. The boiling point of methane is given as 162 ° C (-259.6 ° F) and the melting point of methane is usually written as 182.5 ° C (-296.5 ° F). Methane is generally very stable, but mixtures of methane and air, with a methane content of between 5% and 14 % by volume, explode. The explosion of these compounds has been the case in coal mines and mines and has been the cause of many mine disasters.

How methane gas is formed?

Methane is a powerful greenhouse gas, followed by a second carbon dioxide that can hold heat in the earth's atmosphere for a long time. This gas can come from lakes and wetlands, natural gas pipelines, deep ocean air, and livestock. Understanding the sources of methane, as well as how gas is produced, can give scientists a better understanding of their role in global warming.

Related Topics Link

Locking of Methane Frequency

Methane is a molecule made up of a single carbon atom attached to four hydrogen atoms. Carbon can come as a single isotope (carbon-12 or carbon-13); hydrogen can also take two forms, including deuterium - a hydrogen isotope with one additional neutron. The authors are looking for a very unusual methane molecule replaced by an isotope, known as 13CH3D - a molecule containing a carbon-13 atom and a deuterium atom. Obtaining 13CH3D was important, the researchers thought, because it could be a sign of heat in which methane is being formed - it is important in determining whether methane is microbial or thermogenic.

Last year, Ono and his colleagues, working with scientists from Aerodyne Research, developed a 13CH3D detection tool. This method uses infrared spectroscopy to detect certain wavelengths associated with minute movements within methane molecules; different waves correspond to different isotopes. This spectroscopic method, which is very different from the traditional spectrometric methods developed by others, has a material advantage, allowing its potential transmission to field areas.

Chlorophenyl Methane

Chlorophenyl Methane is a highly sensitive organochlorine compound. It appears colorless in slightly yellow liquid. It is widely used in chemical formulations.

The methyl group and the chloro group are attached to a six-component benzene ring. The common name for chlorophenyl methane is Benzyl chloride.

α - chlorotoluene is another name for Benzyl chloride. The chemical formula of benzyl chloride is C6H5CH2Cl.

We can prepare benzyl chloride from Blanc chloromethylation of benzene.

Treatment of benzyl alcohol with hydrochloric acid can lead to the formation of methane of benzyl chloride.

Industrially, we can fix benzyl chloride by toluene reaction with chlorine. We can write a chemical equation as,

C6H5CH3 + Cl2 → C6H5CH2Cl + HCl

The reaction begins with a free radical process, which involves the fusion of free chlorine atoms. Benzal chloride and benzotrichloride are available as separate reaction products.

When we put oxygen benzyl chloride in front of alkaline potassium permanganate, we get benzoic acid as a product. The chemical equation is labeled as,

C6H5Cl2 + 2KOH + 2 [O] → C6H5COOH + KCl + H2O

We may also use benzyl chloride as a precursor for the preparation of benzyl esters that are also used as plasticizers, flavorants, and even perfumes. We can get dibenzyl ether when benzyl chloride is reacted with aqueous sodium hydroxide. Benzyl chloride can be used in combination with amphetamine-based drugs. Benzyl chloride in reaction with metallic magnesium forms a Grignard reagent.

Also check-

NCERT Chemistry Notes:

Frequently Asked Questions (FAQs)

1. 1.Is methane gas harmful to humans?

Methane alone is non-toxic but can be deadly when mixed with other gases. Methane dissipates oxygen to breathe. It can cause dizziness and headaches, but these are often overlooked until the brain signs that the body is breathing air.

2. 2.What is the main cause of methane gas?

Methane is produced during coal, natural gas, oil production and transportation. Methane extraction is caused by livestock and other agricultural activities and the destruction of agricultural waste in solid urban landfills.

3. 3.Why is methane gas so bad for the environment?

For example, if methane leaks into the air before the use of a leaky pipe - it absorbs heat from the sun, warming the air. It is called greenhouse gas, as carbon dioxide, for this reason.

4. 4.Is methane fossil fuel?

Mineral fuels range from volatile compounds with low carbon-to-hydrogen ratios (such as methane), to liquids (such as petroleum), almost from refined carbon-based materials, such as anthracite coal. Methane can be obtained alone, in combination with oil, or in the form of methane clathrate in hydrocarbons.

5. 5.Can Methane be released into space?

Bacteria can then be used to remove methane from the air. Because of its high efficiency such as thermal gas,Boucher and Folberth both had a conversation that methane depletion could usually compete financially for carbon offsets and the technology was also expensive.

6. How does the concept of methane's global warming potential (GWP) help in understanding its impact on climate change?
The Global Warming Potential (GWP) of methane helps quantify its impact on climate change relative to carbon dioxide. Methane has a GWP of about 28-36 over 100 years, meaning it's 28-36 times more effective at trapping heat in the atmosphere than CO₂ over that period. However, methane has a shorter atmospheric lifetime (about 12 years compared to CO₂'s centuries). This concept is crucial for developing climate policies, as it allows for comparison between different greenhouse gases and helps prioritize mitigation efforts.
7. How does the presence of methane in the atmosphere of other planets or moons inform our understanding of potential extraterrestrial life?
The detection of methane in the atmospheres of other celestial bodies, such as Mars or Saturn's moon Titan, is significant because methane can be a byproduct of biological processes. While not conclusive evidence of life, its presence suggests the possibility of ongoing geological activity or even biological processes, making these bodies targets for further exploration in the search for extraterrestrial life.
8. How does the isotopic composition of methane (e.g., presence of ¹³C or deuterium) provide information about its origin and age?
The isotopic composition of methane can serve as a "fingerprint" indicating its source and history. For example, biogenic methane (produced by living organisms) typically has a lower ¹³C/¹²C ratio compared to thermogenic methane (formed by geological processes). Similarly, the presence of deuterium can provide information about the age and origin of methane. These isotopic signatures are valuable tools in geochemistry and climate science for tracing methane sources and understanding its cycling in the environment.
9. What is the role of methane in the formation of planetary atmospheres, and how does this inform our understanding of planetary evolution?
Methane plays a significant role in the atmospheres of several planets and moons in our solar system, such as Titan and Uranus. Its presence or absence can provide clues about the geological and potentially biological processes occurring on these bodies. On early Earth, methane likely played a role in the primitive atmosphere, contributing to the conditions that may have led to the origin of life. Studying methane in planetary atmospheres helps scientists understand atmospheric chemistry, climate dynamics, and the potential for habitability on other worlds.
10. What is the significance of methane's role in the carbon cycle of wetland ecosystems?
In wetland ecosystems, methane plays a crucial role in the carbon cycle. These environments, often anaerobic, are significant natural sources of methane. Microorganisms in wetland soils produce methane as they decompose organic matter. This process is important for nutrient cycling and energy flow in these ecosystems. However, it also makes wetlands significant contributors to global methane emissions. Understanding this role is crucial for predicting the impact of climate change on wetland ecosystems and their feedback to global carbon cycles.
11. Why is methane considered a greenhouse gas, and how does it compare to carbon dioxide?
Methane is a potent greenhouse gas because it absorbs infrared radiation from the Earth's surface, trapping heat in the atmosphere. While it's less abundant than carbon dioxide, methane is about 25 times more effective at trapping heat over a 100-year period, making it a significant contributor to global warming despite its lower concentration.
12. How does methane behave differently from other hydrocarbons in terms of its physical state at room temperature?
Unlike many other hydrocarbons, methane is a gas at room temperature and atmospheric pressure. This is due to its low molecular weight and weak intermolecular forces (van der Waals forces). Other hydrocarbons with more carbon atoms tend to be liquids or solids at room temperature due to stronger intermolecular attractions.
13. How does methane contribute to the formation of smog, and what are the environmental implications?
Methane contributes to smog formation indirectly. When it reacts with other pollutants in the presence of sunlight, it can form ground-level ozone, a key component of smog. This process can lead to air quality issues in urban areas, affecting human health and plant growth.
14. How does the structure of methane contribute to its tetrahedral shape?
Methane has a tetrahedral shape due to the arrangement of its four C-H bonds. The carbon atom forms sp³ hybrid orbitals, which are oriented at 109.5° angles to each other. This results in the four hydrogen atoms being positioned at the corners of a tetrahedron, with the carbon atom at the center.
15. What is the significance of methane's low boiling point, and how does it relate to its uses?
Methane's low boiling point (-161.5°C or -258.7°F) means it remains a gas under most environmental conditions. This property makes it useful as a fuel gas for heating and cooking, and allows for its transportation through pipelines. However, it also presents challenges for storage and transportation in liquid form, requiring cryogenic temperatures.
16. What is meant by "methane activation" in chemistry, and why is it an area of significant research?
Methane activation refers to chemical processes that convert methane into more reactive or valuable compounds. This is an important area of research because methane's strong C-H bonds make it relatively unreactive, limiting its direct use in many chemical processes. Developing efficient methane activation methods could unlock new ways to use this abundant resource in chemical synthesis and energy production, potentially reducing reliance on crude oil.
17. What is meant by the term "methane clathrate" and why is it of interest to scientists and energy researchers?
Methane clathrates, also known as methane hydrates, are ice-like structures where methane molecules are trapped within a lattice of water molecules. They're of interest because they represent a potentially vast untapped energy source found in ocean sediments and permafrost regions. However, their extraction poses technical challenges and environmental concerns, as their release could significantly impact climate change.
18. How does the presence of methane in the Earth's crust relate to the formation and extraction of fossil fuels?
Methane in the Earth's crust is closely tied to the formation and extraction of fossil fuels. It's a primary component of natural gas and is often found in association with oil deposits. Methane can be formed through thermogenic processes (heat and pressure acting on organic matter over geological time) or through biogenic processes (microbial activity). In coal beds, methane (known as coalbed methane) is adsorbed onto the coal surface. Understanding the distribution and behavior of methane in the crust is crucial for fossil fuel exploration, extraction techniques, and assessing potential environmental impacts of these activities.
19. What is the significance of methane's role in the formation of complex organic molecules in interstellar space?
Methane plays a crucial role in astrochemistry as one of the simplest organic molecules found in space. It can participate in reactions leading to the formation of more complex organic compounds, potentially contributing to the chemical precursors of life. The presence and behavior of methane in interstellar environments provide insights into the chemical evolution of the universe and the potential for organic chemistry beyond Earth.
20. What is the chemical formula for methane, and what does it tell us about its composition?
The chemical formula for methane is CH₄. This formula indicates that each methane molecule contains one carbon atom and four hydrogen atoms. It reflects the tetravalent nature of carbon, showing that carbon forms four single covalent bonds with hydrogen atoms.
21. How does the concept of bond angles in methane relate to its overall molecular geometry?
The bond angles in methane are approximately 109.5° between each C-H bond. This specific angle is a result of the tetrahedral arrangement of the four sp³ hybrid orbitals of the carbon atom. This geometry minimizes electron repulsion and provides the most stable configuration for the molecule, contributing to methane's overall tetrahedral shape.
22. How does the concept of hybridization apply to the carbon atom in methane, and why is this important for understanding its structure?
In methane, the carbon atom undergoes sp³ hybridization, where one s orbital and three p orbitals combine to form four equivalent sp³ hybrid orbitals. This hybridization allows carbon to form four equivalent single bonds with hydrogen atoms, resulting in the tetrahedral structure. Understanding this concept is crucial for explaining methane's geometry, bond angles, and overall stability.
23. What is the significance of methane's tetrahedral molecular geometry in terms of its polarity?
Despite having polar C-H bonds, methane is a non-polar molecule overall. This is due to its tetrahedral geometry, which results in a symmetrical distribution of charge. The dipole moments of the four C-H bonds cancel each other out, leading to a net dipole moment of zero. This property affects methane's solubility and its behavior in various chemical and physical processes.
24. How does the concept of bond dissociation energy apply to methane, and what does it tell us about the molecule's stability?
The bond dissociation energy for a C-H bond in methane is relatively high (about 439 kJ/mol), indicating strong, stable bonds. This high energy requirement for breaking C-H bonds explains methane's chemical stability and its resistance to many reactions at room temperature. It also influences methane's combustion properties and its persistence in the atmosphere.
25. What is the significance of methane being the main component of natural gas?
Methane's role as the primary component of natural gas makes it a crucial energy source. It burns cleanly compared to other fossil fuels, producing less carbon dioxide per unit of energy. This property makes natural gas an important transitional fuel in efforts to reduce greenhouse gas emissions while moving towards renewable energy sources.
26. What is the role of methane in the carbon cycle, and how does human activity impact this cycle?
Methane plays a significant role in the carbon cycle as a form of reduced carbon. It's produced by biological processes and can be oxidized back to CO₂. Human activities, such as fossil fuel extraction, rice cultivation, and livestock farming, have increased atmospheric methane concentrations, disrupting the natural balance of the carbon cycle.
27. What is the significance of methane's role in organic synthesis, particularly in the production of other hydrocarbons?
Methane serves as a crucial starting point for many organic synthesis processes. Through various reactions like steam reforming, it can be converted into synthesis gas (a mixture of CO and H₂), which is used to produce larger hydrocarbons and other organic compounds. This makes methane a key feedstock in the petrochemical industry for producing a wide range of products.
28. How does the combustion of methane differ from that of larger hydrocarbons in terms of products and energy release?
Methane combustion is relatively clean compared to larger hydrocarbons. When burned completely, it produces only carbon dioxide and water vapor. The combustion reaction (CH₄ + 2O₂ → CO₂ + 2H₂O) releases a significant amount of energy per unit mass, making it an efficient fuel. Larger hydrocarbons often produce more complex byproducts and may not burn as completely.
29. What are the safety concerns associated with methane, and how do they relate to its physical and chemical properties?
Methane poses several safety concerns primarily due to its flammability and its ability to form explosive mixtures with air. As it's odorless, colorless, and lighter than air, it can accumulate undetected in enclosed spaces, creating explosion risks. Its low boiling point also presents hazards in handling liquefied natural gas. Understanding these properties is crucial for safe handling and storage of methane and natural gas.
30. What is methane and why is it considered the simplest hydrocarbon?
Methane is the simplest alkane and hydrocarbon molecule, consisting of one carbon atom bonded to four hydrogen atoms. It's considered the simplest because it has the fewest number of carbon atoms possible for a hydrocarbon (just one) and the maximum number of hydrogen atoms that can bond to a single carbon.
31. How does methane form in nature, and what are some major natural sources?
Methane forms naturally through the decomposition of organic matter in anaerobic conditions. Major natural sources include wetlands, termites, and the digestive processes of ruminant animals like cows. It's also produced in the decay of waste in landfills and during the extraction of fossil fuels.
32. How does the process of methane formation in anaerobic environments differ from its production in aerobic conditions?
Methane formation primarily occurs in anaerobic (oxygen-free) environments through a process called methanogenesis, carried out by methanogenic archaea. In these conditions, organic matter is broken down in stages, with methane as the final product. In contrast, aerobic decomposition of organic matter typically produces carbon dioxide instead of methane. Understanding this difference is crucial in managing waste and studying environmental methane sources.
33. What is the relationship between methane and biogas, and how does this relate to sustainable energy production?
Biogas is a mixture of gases produced by the anaerobic digestion of organic matter, with methane as its primary component (typically 50-75%). The production of biogas from waste materials (like agricultural residues or sewage) represents a sustainable energy source, as it captures methane that would otherwise be released into the atmosphere and uses it as a renewable fuel. This process helps in waste management while providing a clean energy alternative.
34. How does methane's reactivity compare to other alkanes, and what does this tell us about its chemical behavior?
Methane is generally less reactive than larger alkanes due to the strength of its C-H bonds and its symmetrical structure. This lower reactivity means it requires more energy to initiate reactions, such as combustion or halogenation. However, this stability also contributes to its persistence in the atmosphere as a greenhouse gas.
35. What role does methane play in the formation of other hydrocarbon fuels, and how is this process utilized in industry?
Methane serves as a primary feedstock for producing other hydrocarbon fuels through processes like the Fischer-Tropsch synthesis. In this process, methane is first converted to synthesis gas (CO and H₂), which is then used to create longer-chain hydrocarbons like gasoline and diesel fuel. This process is particularly important in gas-to-liquids (GTL) technology, allowing the conversion of natural gas into more easily transportable liquid fuels.
36. How does the presence of methane impact the chemistry of Earth's atmosphere, particularly in the troposphere and stratosphere?
In the troposphere, methane contributes to the formation of ozone and other secondary pollutants through complex chemical reactions. In the stratosphere, methane can be oxidized to form water vapor, which plays a role in ozone depletion. Understanding methane's atmospheric chemistry is crucial for climate models and predicting long-term atmospheric changes.
37. What is the importance of understanding methane's phase diagram, particularly in the context of natural gas processing and transportation?
The phase diagram of methane is crucial for natural gas processing and transportation. It shows the conditions (temperature and pressure) under which methane exists as a gas, liquid, or solid. This information is essential for designing efficient and safe systems for storing and transporting natural gas, especially in its liquefied form (LNG). Understanding the phase behavior helps in preventing issues like pipeline freezing or unexpected phase changes during processing.
38. How does methane interact with water molecules, and what are the implications of this interaction for its behavior in aqueous environments?
Methane has low solubility in water due to its non-polar nature. However, it can form weak hydrophobic interactions with water molecules. In aqueous environments, methane tends to form bubbles or escape to the atmosphere. This behavior is important in understanding methane's movement through water bodies, its release from sediments, and its potential impact on aquatic ecosystems. It also affects the design of water treatment processes where dissolved methane may be present.
39. How does the concept of activation energy apply to methane combustion, and what are its practical implications?
The activation energy for methane combustion is relatively high, meaning a significant amount of energy is needed to initiate the reaction. This high activation energy explains why methane doesn't spontaneously combust at room temperature despite being flammable. In practical terms, this property influences the design of combustion systems, safety protocols in handling natural gas, and the efficiency of methane as a fuel. Understanding activation energy is crucial for optimizing combustion processes and developing more efficient catalysts for methane reactions.
40. What are the challenges and potential benefits of methane pyrolysis as a method for hydrogen production?
Methane pyrolysis is a process that decomposes methane into hydrogen and solid carbon without producing CO₂. The main challenges include the high temperatures required (around 1000°C), finding suitable catalysts to lower the energy input, and managing the produced carbon. The potential benefits are significant: it offers a way to produce hydrogen fuel without direct CO₂ emissions, and the solid carbon byproduct could have industrial applications. This method could play a role in transitioning to a hydrogen economy while utilizing existing natural gas infrastructure.
41. What is the relationship between methane and the formation of photochemical smog in urban environments?
While methane itself is not a direct contributor to photochemical smog, it plays an indirect role. In urban environments, methane can react with

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Question : Comprehension:
In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.
The solar system is made up of the sun, planets, moons, asteroids, and comets that 1.______ around it. Its mysteries and wonders have captured the imagination of people from all walks of life, and it continues to be an area of active research and exploration. The sun is at the centre of the solar system and is the largest object in it. The eight planets in the solar system, 2._________ Earth, orbit around the sun in nearly circular paths. While the sun is at the centre of the solar system and dominates its gravitational pull, each planet has its own unique set of characteristics that makes it a fascinating object to study. Each planet in the solar system has unique characteristics and features. 3._________ planets, such as Mercury and Venus, are small and rocky, while others, like Jupiter and Saturn, are much larger and made up mostly of gas. The outer planets, Uranus and Neptune, are 4._______ as 'ice giants' because they contain more water, ammonia, and methane than the gas giants. In addition to the planets, the solar system also has numerous moons, asteroids, and comets. These objects provide important 5.______ about the formation and evolution of the solar system.
Question:
Select the most appropriate option to fill in the blank 5.

Option 1: sets

Option 2: derivations

Option 3: clues

Option 4: biases

Correct Answer: clues


Solution : The most appropriate option is the third option.

Explanation:
Clues refer to hints, evidence, or information that helps in understanding or solving something. In the context of the passage, moons, asteroids, and comets provide crucial information or hints about the formation and evolution of the solar system. They offer valuable insights that aid in understanding how the solar system came into existence and how it has changed over time.

The meanings of the other options are as follows:

  • Sets refer to a group of related objects or things.
  • Derivations refer to the process of obtaining something from a source or origin.
  • Biases refer to prejudices or inclinations that affect judgement or decision-making based on partiality or preference.
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Team Careers360 26 January,2024

Question : Comprehension:
In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.
The solar system is made up of the sun, planets, moons, asteroids, and comets that 1.______ around it. Its mysteries and wonders have captured the imagination of people from all walks of life, and it continues to be an area of active research and exploration. The sun is at the centre of the solar system and is the largest object in it. The eight planets in the solar system, 2._________ Earth, orbit around the sun in nearly circular paths. While the sun is at the centre of the solar system and dominates its gravitational pull, each planet has its own unique set of characteristics that makes it a fascinating object to study. Each planet in the solar system has unique characteristics and features. 3._________ planets, such as Mercury and Venus, are small and rocky, while others, like Jupiter and Saturn, are much larger and made up mostly of gas. The outer planets, Uranus and Neptune, are 4._______ as 'ice giants' because they contain more water, ammonia, and methane than the gas giants. In addition to the planets, the solar system also has numerous moons, asteroids, and comets. These objects provide important 5.______ about the formation and evolution of the solar system.
Question:
Select the most appropriate option to fill in the blank 2.

Option 1: excluding

Option 2: diluting

Option 3: dissolving

Option 4: including

Correct Answer: including


Solution : The most appropriate option is the fourth option.

Explanation: Including means to contain as part of a whole. In this context, it implies that among the eight planets in the solar system, Earth is one of them. "The eight planets in the solar system, including Earth, orbit around the sun in nearly circular paths."

The meanings of the other options are as follows:

  • Excluding means not taking into account or not including.
  • Diluting means to make something weaker or less concentrated.
  • Dissolving means becoming incorporated into a liquid and forming a solution.

 

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Team Careers360 24 January,2024

Question : Deforestation contributes to climate change mainly because it:

Option 1: Releases carbon dioxide into the atmosphere

Option 2: Increases methane emissions

Option 3: Reduces albedo effect

Option 4: Leads to soil erosion

Correct Answer: Releases carbon dioxide into the atmosphere


Solution : The correct answer is(A) Releases carbon dioxide into the atmosphere

Deforestation involves the clearing or removal of forests, resulting in the conversion of forested areas into non-forested land. This process has several negative impacts on the environment, including its significant contribution to climate change.

One of the main reasons deforestation contributes to climate change is the release of carbon dioxide (CO2) into the atmosphere. Trees act as natural carbon sinks, absorbing CO2 from the atmosphere during photosynthesis and storing it in their biomass. When forests are cleared or burned, the carbon stored in trees and vegetation is released back into the atmosphere as CO2.

The increased release of CO2 from deforestation adds to the greenhouse gas concentration in the atmosphere, contributing to the enhanced greenhouse effect and global warming. As CO2 is a potent greenhouse gas, its accumulation in the atmosphere traps heat and leads to an increase in average global temperatures.

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Team Careers360 21 January,2024

Question : Comprehension:

In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.

Global warming is one of the biggest environmental (1)__________ facing the world today. The primary cause of global warming is the (2)__________ of greenhouse gases such as carbon dioxide and methane into the atmosphere. These gases trap heat from the sun, causing the Earth's temperature to rise. The (3)__________ effects of global warming are widespread and include more frequent and severe weather events, rising sea levels and the loss of biodiversity. Many governments and organisations have implemented (4)__________ to reduce greenhouse gas emissions. However, individuals can also play a role in (5)___________ global warming by making small changes to their daily habits, such as reducing their energy consumption and driving less.

Select the most appropriate option to fill in the blank no. 3.

Option 1: negative

Option 2: positive

Option 3: neutral

Option 4: negligible

Correct Answer: negative


Solution : The correct choice is the first option.

Negative accurately describes the detrimental or harmful effects of global warming mentioned in the passage.

The complete sentence is: "The negative effects of global warming are widespread and include more frequent and severe weather events, rising sea levels, and the loss of biodiversity."

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Team Careers360 21 January,2024

Question : Sentences of a paragraph are given below. While the first and the last sentences ( 1 and 6) are in the correct order, the sentences in between are jumbled up (A to D). Arrange the sentences in the correct order to form a meaningful and coherent paragraph.

1. Biogas is a mixture of methane, carbon dioxide and hydrogen with others.
A. Biogas is produced by anaerobic degradation of animal wastes (some plant wastes) in presence of water.
B. Thus, biogas is a non-polluting, cleaned and low cost fuel.
C. Anaerobic degradation means breakdown of organic matter which is done in the absence of oxygen.
D. It is mostly used in rural areas where ample animal and agricultural waste is available.
6. Biogas eliminates the risk of health hazards offered by other fuels.

Option 1: DABC

Option 2: CBDA

Option 3: ACBD

Option 4: BDAC

Correct Answer: ACBD


Solution : The correct choice is the third option.

The initial sentence (A) introduces the concept of biogas as a mixture of methane, carbon dioxide, and hydrogen. The subsequent sentence (C) explains the process of biogas production through anaerobic degradation, clarifying that it occurs in the absence of oxygen. The third sentence (B) follows by highlighting the positive aspects of biogas, stating that it is a non-polluting, clean, and low-cost fuel. Finally, the last sentence (D) concludes the paragraph by noting that biogas is primarily used in rural areas where ample animal and agricultural waste is available, eliminating the risk of health hazards associated with other fuels.

Therefore, the correct answer is ACBD.

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Team Careers360 25 January,2024
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