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Decomposition Reaction - Definition, Examples, Types, Uses, FAQs

Decomposition Reaction - Definition, Examples, Types, Uses, FAQs

Edited By Team Careers360 | Updated on Jun 23, 2022 04:18 PM IST

What is Decomposition reaction?

Decomposition reaction definition is a chemical reaction in which one material falls into two or more products. Standard response format

The standard format for rotting response is given below.

AB -> A + B

Where AB is the parent molecule (reactant) and A&B are the product molecules.

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Decomposition reaction example:

Corruption reacts around us, but we often do not see it.

Some typical examples of decomposition reactions are given below...

Carbonic acid decomposition in soft drinks, which can be represented by chemical equation H2CO3 → H2O + CO2

Water electrolysis to produce hydrogen and oxygen.

What is the contradiction of decomposition reaction?

The opposite of the decomposition reaction is a composite response. Is every reaction to decay a corpse?

No, not all rotting reactions are complete. The decomposition reactions can be both physical exhaustion or anxiety.

For example:

NO rot to N2 & O2 is bad.

Ozone depletion of oxygen is bad.

What are the uses of Decomposition reaction?

One of the main uses for the decomposition reaction to decompose meaning is the extraction of metals from their ores. For example, zinc can be obtained from calamine by placing it in the reaction of decomposition. In the same way, sodium

can be found in sodium chloride.

Double decomposition reaction

A decomposition reaction in which two reactants alternate negative and positive ions and a new chemical is formed is known as double decomposition reaction.

NCERT Chemistry Notes :

Types of Decomposition reaction

  1. Thermal decomposition reaction

The thermal decomposition reaction can be defined as a reaction to decomposition of thermal decomposition. Such reactions are often exhausting because energy is needed to break down chemical bonds and to disassociate.

Example of thermal decomposition reaction of a hot rot reaction is given below.

CaCO3 → CaO + CO2

This process is used in the production of fast lime, which is important in many industries.

  1. Electrolyte Decomposition reaction

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Electrolytic decomposition chemistry response is a type of decomposition reaction wherein activation power is supplied within the form of electrical electricity. An electrolytic decomposition reaction which is liquid electrolysis

Example of example of electrolytic decomposition reaction:

2H2O → 2H2+O2

  1. Photochemical decomposition

A photo decomposition reaction is type of decomposition reaction by which reactant is released to builders along with absorbing energy from photons. An example of an image decay response is decay of dioxygen and oxygen radical, as represented by the chemical equation given below.

O3+hν → O2 +O.

Use of Decomposition reaction

Making cement or calcium oxide.

Metal Processes: Extraction of metals from their oxides, chlorides, etc.

Ease of acid digestion.

Welding Thermite.

What Happens During Response Rotation?

During the decomposition reaction, the bonds between the atoms drop to the original object. Atoms then reorganize to form new bonds, resulting in new materials with different properties.

  1. Features of Rot Reaction

  2. One responder and two or more products

  3. It requires energy

Examples of Rotting Response: An example of a decay response is the decomposition of carbonic acid (H2CO3) into carbon dioxide (CO2) and water (H2O)

How Can You Measure a Decomposition?

To quantify the equation, we measure the number of oxygen atoms on the right of the equation and compare it with the left. We notice that there are two oxygen particles on the right and three on the left. Therefore, we multiply right-O at 3 and left to O at 2.

Note that we will increase the total KClO3 by 2 and measure oxygen.

Now, we note that potassium (K) and chlorine (Cl) are not measured. To the left of the equation, there are two K and Cl atoms, and on the right, there are only one atom. Therefore, we multiply KCl built in 2 and get the final number.

Alternative Response to Decay

Catalytic decomposition

In this type of decomposition, the reaction occurs with the help of a catalyst.

For example

The decomposition of hydrogen peroxide in water and oxygen is stimulated by an enzyme called catalase

2 H2O2 (l) + catalase (enzyme) → 2H2O (l) + O2 (g)

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Examples of decomposition reactions in Real Life

The decay response has few applications in industry and in everyday life.


  1. Production of calcium oxide or quicklime

  2. Lithium oxide production

  3. Preparation of oxygen and carbon dioxide

  4. In metallurgy, the extraction of metals from oxides and chlorides by electrolytic decomposition.

Daily life:

  1. When a soda bottle is opened, carbonic acid decomposes producing water and carbon dioxide, causing fizz.

  2. During our digestive system, carbohydrates, fats, and proteins decompose into many simple substances.

  3. Photographic films are covered with silver bromide, which, when exposed to light, splits into silver and bromine.

  4. When hydrogen peroxide is used to cut or wound, peroxide decomposes, and forms oxygen bubbles and explodes.

  5. Many environmental degradations is seen in foods such as fermentation and pollution.

  6. Food rot and vegetable peels produce excellent nutrients and soil compost.


  1. There are several analytical methods such as mass spectrometry, gravimetric analysis, and thermogravimetric analysis


Heat decomposition, or thermolysis, is a chemical decay caused by heat. The decay temperature of an object is the temperature at which the substance decomposes chemically. The reaction often ends as heat is needed to break down the chemical bonds in the decaying area. When decay is disturbing enough, a good reaction loop is created producing a hot escape along with possibly an explosion. Some of the oxides, especially of the less fragile metals, decompose meaning when heated to a sufficient temperature. An ancient example is the decay of mercuric oxide to provide oxygen and mercury metal. When water is heated above 2000°C, a small percentage of it decomposes into OH, monatomic oxygen, monatomic hydrogen, O2, and H2.

The most common decomposing element is carbon monoxide at -3870°C (-7000°F). Decomposition of nitrates, nitrites, and ammonium compounds. Ammonium dichromate in heat produces nitrogen, water, and chromium oxide. Ammonium nitrate at high temperatures produces dinitrogen oxide ("laughing gas") and water. Ammonium nitrite in heat produces nitrogen gas and water. Barium azide in heat produces barium iron and nitrogen gas. Sodium azide at a temperature of 300 ° C provides nitrogen and sodium. Sodium nitrate in heat produces sodium nitrite and oxygen gas. Organic chemicals such as high-temperature amines cause Hofmann to dissolve and produce secondary amines and alkenes.

Ease of Decomposition reaction:

When metals are at the bottom of a series of reactivity, their compounds usually decompose easily at high temperatures. This is because the form of solid bonds between atoms at the top of a series of reactivity, and strong bonds is difficult to break.

For example, copper is near the bottom of a series of reactivity, and copper sulphate begins to decompose at about 200 ° C, rising rapidly at high temperatures to about 560 ° C. In contrast, potassium is close to the top of the series of reactivity, and potassium sulphate does not decompose where it melts at about 1069 ° C, or where it boils.

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Frequently Asked Question (FAQs)

1. CO2 obtained by total decomposition of 20 g CaCO3 in STP approx.
  1. 4.481

  2. 2.24l

  3. 44.8l

  4. 48.4l

Answer: (a)

2. 2Pb reaction (NO3 )2 → 2PbO + 4NO2 + O2 is a type of _______reaction.
  1. migration

  2. double decomposition

  3. decomposition

  4. none of the above

Answer: (c)

3. In the transfer now in acidic water we get hydrogen and oxygen. This is kind of
  1. oxidation reaction

  2. hot rot

  3. electrolysis

  4. none of the above

Answer: (c)

4. The correct expression for the decay of silver chloride to silver and chlorine is approx.
  1. AgCl2(s)→ Ag(s)+ 2Cl(g)

  2. 2AgCl(s)→ 2Ag(s)+ Cl2(g)

  3. AgCl2(s)→ Ag(s)+ Cl2(g)

  4. AgCl→ Ag(s)+Cl(g)

Answer: (b)

5. Reaction when two compounds exchange their atoms to form new compounds
  1. decomposition

  2. relocation

  3. migration

  4. integration

Answer: (b)

6. Decomposition of silver chloride occurs by
  1. heat

  2. sunlight

  3. water

  4. electricity

Answer: (b)

7. How many sodium carbonate moles are formed by the decomposition of 0.2 moles of sodium bicarbonate?
  1. 0.1

  2. 0.2

  3. 0.05

  4. 0.025

Answer: (a)

8. Get the volume of CO2 released after heating 9.85 g of BaCO3 in STP.
  1. 2.06 litres

  2. 2.12 litres 

  3. 1.12 litres

  4. 4.84 litres

Answer: (c)

9. Sulfate iron in heat provides reddish-brown residues of ferric oxide. This is because of
  1. decomposition

  2. migration

  3. combination

  4. none of the above

Answer: (a)


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