Which of the following statements is correct?

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(D) Option $A$ is incorrect because the conversion of chromate to dichromate occurs in acidic medium $(pH < 7)$,not basic. The correct reaction is $2C

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$+2$ oxidation state is shown by $Ce, Tb$

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(D) Option $A$ is incorrect because the conversion of chromate to dichromate occurs in acidic medium $(pH Option $B$ is incorrect because $I^-$ is oxidized to $I_2$ by $KMnO_4$ in acidic medium,not $IO_3^-$.Option $C$ is incorrect because Misch metal is an alloy consisting of a lanthanoid metal (typically $Ce$ $\approx 50\%$,$La$ $\approx 25\%$,$Nd$ $\approx 18\%$,$Pr$ $\approx 5\%$) and iron ($Fe$ $\approx 5\%$).Option $D$ is correct because $Ce$ and $Tb$ are known to exhibit the $+2$ oxidation state in addition to their common $+3$ state.

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