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MolSynapse / Question bank / p-Block Elements: Groups 17 and 18 / Halogen compounds: HX, oxoacids, bleaching powder

JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ph054

Select the correct statement(s) about bleaching powder (Ca = 40, O = 16, Cl = 35.5).

AHeating it with a trace of a cobalt salt gives $O X_{2}$ and $CaCl X_{2}$ .
BIt contains chlorine in the oxidation states $+ 1$ and $- 1$ .
CIts available chlorine refers only to the chlorine present as $Cl X^{-}$ , so for pure $Ca (OCl) Cl$ it is about 28 per cent.
DFor pure $Ca (OCl) Cl$ the available chlorine is about 56 per cent.

Answer: A, B, D

A:

2 CaOCl X_{2} 2 CaCl X_{2} + O X_{2}

. B:

OCl X^{-}

and

Cl X^{-}

. C is false: available chlorine is the

Cl X_{2}

liberated by dilute acid, 1 mol (71 g, taking both Cl atoms) per mol of

CaOCl X_{2}

, not the

Cl X^{-}

alone. D: molar mass = 40 + 16 + 71 = 127, so 71/127 x 100 = 55.9 per cent.

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