Question

A light sensitive compound 'X' of silver is used in black and white photography. On exposure to osunlight, the colour changes to gray:
a) Identify 'X'
b) Write a chemical equation to express the above change
c) Identify the type of chemical reaction

Answer 1

a) the compound X is silver chloride.

b) 2Agcl2 gives 2Ag + cl2(g)

c) the type of the reaction is photochemical decomposition. 

a) the compound X is silver chloride.

b) 2Agcl2 gives 2Ag + cl2(g)

c) the type of the reaction is photochemical decomposition. 

Answer 2

(a) Compound 'X' can be either silver Chloride or silver bromide or silver iodide
(b) 2AgCl -----> 2Ag + Cl2
(c) The type of reaction is photolysis , i. e., photochemical decomposition