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Which of the following forms a set of complex and a double salt, respectively?
A
$CuSO_4\cdot5H_2O$ and $CuCl_2\cdot4NH_3$
B
$PtCl_2\cdot2NH_3$ and $PtCl_4\cdot2HCl$
C
$K_2PtCl_2\cdot2NH_3$ and $KAl(SO_4)_2\cdot12H_2O$
D
$NiCl_2\cdot6H_2O$ and $NiCl_2(H_2O)_4$
Detailed Solution
$K_2PtCl_2\cdot2NH_3$, i.e. $K_2[Pt(NH_3)_2Cl_2]$, is a complex salt (retains a complex ion in solution), while $KAl(SO_4)_2\cdot12H_2O$ (potash alum) is a double salt (dissociates completely into its constituent simple ions in solution).