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HCl is unsuitable for permanganate titrations because
AIt bleaches permanganate
BIt precipitates Mn2+ ions
CIt is oxidised to chlorine
DIt forms insoluble KCl
Answer & Solution
Correct answer: C. It is oxidised to chlorine
Permanganate also oxidises Cl(-) to Cl2, so some oxidant is wasted on the acid itself.
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