(A): Average oxidation number of chlorine in bleaching powder is zero.

(R): Oxidation number of chlorine is always zero.

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Both A and R are true and R is the correct explanation

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

A is true but R is false

A is false but R is false

answer is C.

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Detailed Solution

Bleaching powder : Ca(OCl)Cl

Oxidation number of Cl bonded to Oxygen is +1 as Oxygen is more electronegative than Cl

Oxidation number of Cl bonded to metal is - 1

Average oxidation number of Cl = $\frac{- 1 + 1}{2} = Zero$

Chlorine can exhibits -1 ,0 , +1 ,+3 ,+5,+7

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