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Choose correct statements (s)
(i) Both Manganate and permanganate ions are tetrahedral and diamagnetic
(ii) Permanganate titrations are more satisfactory in hydrochloride acid
(iii) Manganous salt is oxidized to a black residue, in the pressure of ZnO

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Both (i) and (iii)

Only (ii)

Both (ii) and (iii)

Only (iii)

answer is D.

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Detailed Solution

i) Manganate is para magnetic ion
ii) $K M n O_{4}$ oxidises $H C l$ into $C l_{2}$
iii) $K M n O_{4} + M n S O_{4} + H_{2} O \overset{Z n O}{\to} M n O_{2} + K_{2} S O_{4} + H_{2} S O_{4}$

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