During titration, H2SO4 is preferably used over HCI and HNO3 to make the solution acidic because

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H2SO4 is a strong oxidising agent and it reacts with KMnO4 during titration

Some KMnO4 is consumed during the reaction with H2SO4

H2SO4 does not react with KMnO4 or the reducing agent used

H2SO4 can turn colourless KMnO4 to pink at the end point

answer is C.

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Detailed Solution

To avoid oxidation of any chemical reaction.

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