JEE Advanced Chemistry question

10 g of bleaching powder on reaction with KI required 100 mL of 1 N hypo. Thus, % of pure bleaching powder is

(A)100%
(B)80%
(C)63.5%Correct
(D)35.5%

Answer: (C)

Solution

The reacting-equivalence chain is CaOCl2 ≡ Cl2 ≡ I2 ≡ 2Na2S2O3. Milliequivalents of hypo used = 100 mL × 1 N = 100 meq = 0.1 equivalent, so the bleaching powder present also amounts to 0.1 equivalent.

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Question ID VK-159453