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Q.

Amount of oxalic acid present in a solution can be determined by its titration with ${KMnO}_{4}$ solution in the presence of $H_{2} {SO}_{4}$ The titration gives unsatisfactory result when carried out in the presence of HCl because HCl

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a

oxidises oxalic acid to carbon dioxide and water

b

gets oxidised by oxalic acid to chlorine

c

furnishes $H^{+}$ ions in addition to those from oxalic acid.

d

reduces permanganate to ${Mn}^{2 +}$

answer is D.

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Detailed Solution

The statement d is correct since the standard reduction potential of ${MnO}_{4}^{-}, {Mn}^{2 +}, H^{+} ∣ Pt$ is larger than that of ${Cl}^{-} |{Cl}_{2} (g)| Pt$ Thus, ${Cl}^{-}$ is oxidized to ${Cl}_{2}$ while ${MnO}_{4}^{-}$ is reduced to ${Mn}^{2 +}$

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