Which of the following forms a set of complex and a double salt, respectively?

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${CuSO}_{4} \cdot 5 H_{2} O$ and ${CuCl}_{2}, 4 {NH}_{3}$

${PtCl}_{2} \cdot 2 {NH}_{3}$ and ${PtCl}_{4} \cdot 2 HCl$

$K_{2} {PtCl}_{2}, 2 {NH}_{3}$ and $KAl {({SO}_{4})}_{2}, 12 H_{2} O$

${NiCl}_{2} \cdot 6 H_{2} O$ and ${NiCl}_{2} {(H_{2} O_{})}_{4}$

answer is C.

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Detailed Solution

Salt, which when dissolved in water undergo partial ionisation and forms a simple cation and a complex anion, or a simple anion or a complex cation, is a complex compound, e.g., K₂PtCl₂.2NH₃.
Salt, which when dissolved in water, undergoes complete ionization and forms simple cation and two different simple anions or a simple anion and two different simple cations, e.g., Alum, mohr’s salt.

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