Given below are a few electrolytes, indi...

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 ?

NacI

`MgSO_(4)`

`AL_(2) (SO_(4))_(3)`

`K_(4) [Fe(CN)_(6)]`

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The correct Answer is:

Gold sol. have negative charge. So `Al_(2) (sO_(4))_(3)` is most effective for coagulation.

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