A: Coagulation power of ${Al}^{+ 3}$ is more than ${Na}^{+}$
R: Greater the valency of the flocculating ion added, greater is its power to cause precipitation (Hardy-Schulze rule)

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Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are true and (R) is not the correct explanation of (A)

(A) is true but (R) is false

Both (A) and (R) are false

answer is A.

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Detailed Solution

Greater the valency of the coagulating ion the more is the power to coagulate the colloidal solution

${Fe}^{+ 3}$ and ${Na}^{+}$ iron has more charge and it have power to cause precipitation

Hence, the correct option is A.

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