Given below are a few electrolytes, indicate which one among them will bring about the coagulation of a gold sol. quickest and in the least of concentration?

NaCl

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MgSO4

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Al2(SO4)3

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K4[Fe(CN)6]

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Solution

The correct option is D K4[Fe(CN)6]
Higher the charge on anion or cation, greater its coagulation power

$K_{4} [F e (C N)_{6}] (r) 4 K^{+} + [F e (C N)_{6}]^{- 4}$

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