Question

Name decomposition reaction which takes place in the presence of sunlight

Answer 1

A decomposition reaction which occurs in the presence of light is called phtochemical reaction. Photochemical decomposition of silver salts and hydrogen peroxide.

Example-

1. 2AgCl arrow forms 2Ag + Cl2
2. 2H2O2 arrow forms 2H2O + O2

Answer 2

(1.) 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

$2H_{2}</p><p>O→2H_{2} +O _{2}$