Question

Q1. Decomposition reactions require energy either in the form of heat or light or electricity for breaking
down the reactants. Give an equation for decomposition reaction where energy is supplied in the form of
electricity.
​

Answer 1

Answer:

Decomposition on heating

Calcium carbonate when heated gives quicklime (CaO) and carbon dioxide

CaCO

3

→CaO+CO

2

(2.) Decomposition by light

Silver chloride decomposes to silver and chlorine in presence of sunlight

2AgCl→2Ag+Cl

2

(3). Decomposition by electricity

Water on electrolysis gives hydrogen and oxygen

2H

2

O→2H

2

+O

2

Answer 2

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★Decomposition by electricity

Water on electrolysis gives hydrogen and oxygen

Equation:

$\sf\red{2H_2O\to 2H_2+O_2}$

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