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Question

The coagulating power of electrolytes having ions Na+,Al3+ and Ba2+ for arsenic sulphide solution increases in the order:

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

The correct option is C Na+<Ba2+<Al3+
Hardy- Schulze Law : According to them, the greater the valency of the active ion, greater is the power to cause coagulation. Active ion is responsible for coagulation.

In the case of negatively charged sols (As2S3 is negative sol), the coagulation power is in order of :
Al+3>Ba+2>Na+

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