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a

Titration of KMnO4 is carried out in presence of HCl.

b

Titration of KMnO4 is carried out in presence of HNO3

c

Titration of KMnO4 is carried out in presence of H2SO4

d

All

answer is C.

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Detailed Solution

(1) Unsatisfactory, since HCl is oxidized to Cl2. 2Cl⊖⟶Cl2+2e−Also, nascent oxygen produced from (KMnO4 + HCI) is partly used up to oxidises HCI to Cl2. (2)Unsatisfactory since HNO3 itself is a noxidizing agent which reacts with reducing agents.  Also SO42− can not be okidized further due to maximum O.S.  of S is +6 in SO42−. Moreover, H2SO4 does not give any nascent oxygen of its own  to oxidise the reducing agent.
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