Question

An example of a double salt is

• A. bleaching powder
• B. $K_4[Fe(CN)_6]$
• C. hypo
• D. potash alum

Answer 1

Answer: (D)

potash alum

Answer 2

Double salts are additon or molecular compounds which are formed by two apparently saturated compounds but they lose their identity when dissolved in water. The most common example of double salt is potash alum $K_2SO_4 \, \cdot Al_2(SO_4)_3 \, \cdot24H_2O.$