Silver chloride kept in a china dish turns grey in sunlight.

(a) Write the colour of silver chloride when it was kept in the china dish.

(b) Name the type of chemical reaction taking place and write the chemical equation for the reaction.

(c) State one use of the reaction. Name one more chemical which can be used for the same purpose.

(a) The colour of silver chloride when kept in the china dish is white.

(b) The type of chemical reaction taking place is a photolytic decomposition reaction (or photochemical decomposition).

The balanced chemical equation is:

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

(c) Use of the reaction: This reaction is used in black and white photography.

Another chemical that can be used for the same purpose is silver bromide ($\text{AgBr}$).