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Q.

Permanganometrc titrations in presence of HCl are not satisfactory because

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a

HCl is a weak acid

b

HCl is a volatile acid

c

$K M n O_{4}$ will oxidise HCl into $C l_{2}$

d

$K M n O_{4}$ will show disproportination in presence of HCl

answer is C.

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Detailed Solution

Permanganate titration is not carried out in the presence of hydrochloric acid because some of the hydrochloric acid gets oxidised to chlorine gas. Hence, we do not get the correct endpoint for any given titration.

2KMnO₄(aq)+16HCl(aq)→2KCl(aq)+2MnCl₂(aq)+8H₂O(l)+5Cl₂(g)↑

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Permanganometrc titrations in presence of HCl are not satisfactory because