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Q.
An example of a double salt is
AIPMTAIPMT 1989The p-Block Elements
Solution:
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 $K_2SO_4 \, \cdot Al_2(SO_4)_3 \, \cdot24H_2O.$