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Question

The coagulating power of electrolytes having ions Na+,Al3+ and Ba2+ for arsenic aulphide sol increase in the order

A
Al3+<Ba2+<Na+
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B
Na+<Ba2+<Al3+
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C
Ba2+<Na2+<Al3+
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D
Al3+<Na+<Ba2+
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Solution

The correct option is B Na+<Ba2+<Al3+
According to Hardy Schulze rule, greater the charge on oppositively charged ion, greater is its coagulating power. Since arsenic sulphide is a negatively charged sol, thus the order of coagulating power is Na+<Ba2+<Al3+

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