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  • Assertion The answer is the option (i): Coagulation power of {Al}^{3+} is more than {Na}^{+} Reason (R): Greater the Valency of the flocculating ion added, greater is its power to cause precipitation (Hardy-Schulze rule).

In the following question, a statement of Assertion The answer is the option (i) followed by a statement of Reason (R) is given. Choose the correct option out of the following choices:

Assertion The answer is the option (i): Coagulation power of \text {Al}^{3+} is more than \text {Na}^{+}
Reason (R): Greater the Valency of the flocculating ion added, greater is its power to cause precipitation (Hardy-Schulze rule).

(i) Both Assertion and Reason are correct and the Reason is the correct explanation for Assertion.
(ii) Both Assertion and Reason arc correct but Reason is not the correct explanation for Assertion.
(iii) Assertion is correct but Reason is incorrect.
(iv) Both Assertion and Reason are incorrect.
(v) Assertion is incorrect but Reason is correct.

Answers (1)

The answer is the option (i) Hardy-Schulze law states that a higher valency of coagulating ion leads to higher power to coagulate the colloidal solution. So, \text {Al}^{3+} has higher coagulation power than \text {Na}^{+}.

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