Duration: 2:09

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(1) If both Assertion (A) and Reason (R) are True and the Reason (R) is a correct explanation of the Assertion (A).
(2) If both Assertion (A) and Reason (R) are True but Reason (R) is not a correct explanation of the Assertion (A).
(3) If Assertion (A) is True but the Reason (R) is False.
(4) If Assertion (A) is False but Reason (R) is True.
Assertion (A): In the coagulation of negatively charged arsenic sulphide sol, the coagulating power decreases in the order, \( \mathrm{Al}^{3+}\mathrm{Ba}^{2+}\mathrm{Na}^{+} \).

Reason (R): Generally greater the valency of coagulating ion, the greater is its power of coagulation.
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