Which of the following has the maximum coagulation value for an arsenic sulphide sol?

NaCl

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B a C l_{2}

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A l C l_{3}

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

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Solution

The correct option is A NaCl
A sulphide sol is negatively charged and since $N a$ has the least positive charge on it, $N a C l$ would have has highest coagulation value. This means that you would need more $N a C l$ as compared to the other compounds to coagulate the sol.

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Arsenous sulphide sol has negative charge. The maximum coagulating power for precipiatating it is of:

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