Which of the following is a double salt?

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$[Cu {({NH}_{3})}_{4}] {SO}_{4}$

$K_{2} {SO}_{4} \cdot {Al}_{2} {SO}_{4} \cdot 24 H_{2} O$

$K_{4} [Fe (CN)_{6}]$

$Cd [{CdCl}_{4}]$

answer is C.

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Detailed Solution

$K_{2} {SO}_{4} \cdot {Al}_{2} {SO}_{4} \cdot 24 H_{2} O$ is a double salt.

A double salt is a crystalline salt that consists of two simple salts but has a different crystal structure from both of them. All salts have anions and cations, thus a double salt has more than one of each. In the double salt, the two salt components crystallize in the same ionic lattice.

Hence, option C is correct.

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