D And F Block Elements Question 15
Question 15 - 2024 (30 Jan Shift 2)
Alkaline oxidative fusion of $MnO _2$ gives “A” which on electrolytic oxidation in alkaline solution produces B.
$A$ and $B$ respectively are:
(1) $Mn _2 O _7$ and $MnO _4^{-}$
(2) $MnO _4{ }^{2-}$ and $MnO _4^{-}$
(3) $Mn _2 O _3$ and $MnO _4{ }^{2-}$
(4) $MnO _4{ }^{2-}$ and $Mn _2 O _7$
Show Answer
Answer (2)
Solution
Alkaline oxidative fusion of $MnO _2$ :
$2 MnO _2+4 OH^{-}+O _2 \rightarrow 2 MnO _4^{2-}+2 H _2 O$
Electrolytic oxidation of $MnO _4{ }^{2-}$ in alkaline medium.
$MnO _4^{2-} \rightarrow MnO _4^{-}+e^{-}$
