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

Answer 1

The correct option is A 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:

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

Such chemical reaction in which two or more products are formed from a single reactant is called a decomposition reaction. It is a decomposition reaction that occurs in the presence of light and hence it is a photochemical/photolytic decomposition reaction.