Question

Which among the following statement (s) is/are true? Exposure of silver chloride to sunlight for a long duration turns grey due to 

(i) The formation of silver by decomposition of silver chloride. 

(ii) Sublimation of silver chloride. 

(iii) Evolution of chlorine gas from silver chloride. (iv) Oxidation of silver chloride. 

A. (i) only B. (i) and (iii) C. (ii) and (iii) D. (iv) only

Answer 1

When silver chloride is exposed to sunlight it undergoes decomposition and turns grey due to the formation of silver metal which provides the grey colour. Although Cl₂ gas is also evolved but, it is not responsible for grey colour. 

Reaction involved is: 

2AgCl → 2Ag + Cl₂