JEE Advanced 2019 Chemistry question

Fusion of with KOH in presence of produces a salt **W**. Alkaline solution of **W** upon electrolytic oxidation yields another salt **X**. The manganese containing ions present in **W** and **X**, respectively, are **Y** and **Z**. Correct statement(s) is(are)

(A)In aqueous acidic solution, **Y** undergoes disproportionation reaction to give **Z** and Correct
(B)Both **Y** and **Z** are coloured and have tetrahedral shapeCorrect
(C)**Y** is diamagnetic in nature while **Z** is paramagnetic
(D)In both **Y** and **Z**, -bonding occurs between -orbitals of oxygen and -orbitals of manganeseCorrect

Answer: (A),(B),(D)

Solution

, so W = and Y = (manganate, Mn +6). Electrolytic oxidation: , so X = and Z = (Mn +7). (A)

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Question ID VK-026831