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Question

Arrange the following in the decreasing order of their coagulation power: Al3+,Na+,Ca2+

A
Al3+ = Ca2+ = Na+
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B
Na+ > Ca2+ > Al3+
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C
Na+ > Al3+ > Ca2+
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D
Al3+ > Ca2+ > Na+
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Solution

The correct option is D Al3+ > Ca2+ > Na+

Greater the valency of the flocculating ion added, greater is its power to cause precipitation (Hardy Schulze rule).


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