Question

Assertion (A): Silver chloride is always kept in a dark coloured bottle.
Reason (R): Photolytic decomposition of silver chloride occurs in the presence of light.

• A. Both A and R are true but R is not the correct explanation of A
• B. A is false but R is true
• C. Both A and R are true and R is the correct explanation of A
• D. A is true but R is false

Answer 1

The correct option is C Both A and R are true and R is the correct explanation of A

Silver chloride decomposes to two different products i.e. silver and chlorine gas on exposure to light. Therefore, it is always kept in dark coloured bottles which restricts the light inside the bottle.
The balanced chemical equation for decomposition of silver chloride is:

$2\text{AgCl(s)}\to \text{2Ag(s)}+{\text{Cl}}_2\text{(g)}$

Chemical reaction in which a single reactant produces two or more products in presence of light are known as photolytic decomposition reaction.