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Why are permanganate titrations unsatisfactory in hydrochloric acid?
AHCl reduces the indicator
BHCl is oxidised to chlorine
CHCl forms a purple complex
DHCl precipitates MnO2
Answer & Solution
Correct answer: B. HCl is oxidised to chlorine
Permanganate oxidises chloride to chlorine, consuming extra titrant and spoiling the result.
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