\({MnO}_{4}^{-}\)
\(Mn\) is in \(+7\) oxidation state (highest) hence cannot be simultaneously oxidized or reduced
$3\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{B} \xrightarrow{{4\,HCl}}\mathop {2C}\limits_{(Purple)} + Mn{O_2} + 2{H_2}O$
$3\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{C} \xrightarrow{{{H_2}O,KI}}2\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{A} + 2KOH + \underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{D} $
ઉપરોક્ત શ્રેણીબધ્ધ પ્રક્રિયાઓમાં $A$ અને $D$ અનુક્રમે શું હશે?
(પ. ક્ર. $Ce = 58,\,Lu = 71,\,La = 57,\,Yb = 70$ )
[ આપેલ : પરમાણુ ક્માંક : $\mathrm{C}: 6, \mathrm{Na}: 11, \mathrm{O}: 8, \mathrm{Fe}: 26, \mathrm{Cr}: 24]$