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Colloidal Solutions

Given below a...

Question

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?

A

N a C l

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B

M g S O_{4}

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C

A l_{2} (S O_{4})_{3}

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D

K_{4} [F e (C N)_{6}]

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Solution

The correct option is C $A l_{2} (S O_{4})_{3}$
As $A l_{2} (S O_{4})_{3}$ gives highest cation concentration with maximum positive charge, it will bring about the coagulation of a gold sol quickest and in the least of concentration.

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