Which one is a mixed salt [DPMT 1985]

1.	Which one is a mixed salt [DPMT 1985]
A.	\[NaHS{{O}_{4}}\]
B.	\[NaKS{{O}_{4}}\]
C.	\[{{K}_{4}}Fe{{(CN)}_{6}}\]
D.	\[Mg(OH)Cl\]
Answer» C. \[{{K}_{4}}Fe{{(CN)}_{6}}\]

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Which one is a mixed salt [DPMT 1985]

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