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Q.

Which of the following electrolytes will be most effective in the coagulation of gold sol?

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a

${NaNO}_{3}$

b

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

c

${Na}_{3} {PO}_{4}$

d

${MgCl}_{2}$

answer is D.

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Detailed Solution

The most efficient use of ${MgCl}_{2}$ is in the coagulation of Gold sol. The charge of gold sol is negative. The electrolyte best capable of generating its coagulation will be that containing positive ions with the highest valency (Hardy Schulze rule)

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