Question

what is a decomposition reaction give two examples each of decomposition taking place due to heat light and electricity

Answer 1

A decomposition reaction is a type of chemical reaction in which a single compound breaks down into 2 or more elements or new compounds.
Examples-due to heat
1) calcium carbonate decomposes in calcium oxide & carbon dioxide when heated.
2)When heated strongly potassium chlorate decomposes into potassium chlorite and oxygen.
Examples - Due to light
1) silver chloride decomposes into silver and chlorine .
2) hydrogen peroxide decomposes into water and oxygen.
ex- due to electricity.
1)water decomposes into hydrogen and oxygen.
2)sodium chloride decomposes into sodium and chlorine.

Answer 2

Answer:

The chemical reaction in which one reactant breaks down into two or more products is known as the Decomposition reaction.

Explanation:

The chemical reaction in which one reactant breaks down into two or more products is known as the Decomposition reaction.

Decomposition reaction can be written as:

AB → A + B

Decomposition on heating:

Calcium carbonate when heated decomposes into quick lime (CaO) and carbon dioxide:

CaCO₃​ → CaO + CO₂

Phosphoric acid decomposes into diphosphoric acid and water:

2 H₃PO₄ → H₄P₂O₇ + H₂O

​

Decomposition by light:

Silver chloride decomposes to silver and chlorine:

2AgCl → 2Ag + Cl₂

Hydrogen peroxide decomposes to hydrogen and water in presence of light.

2H₂O₂ → 2H₂ +O₂

​

Decomposition by electricity:

Water on electrolysis gives hydrogen and oxygen.

2H₂O → 2H₂ +O₂

Decomposition of Salt gives Sodium ion and Chlorine ion.

2NaCl → 2Na⁺ + 2Cl⁻

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