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JEE Advanced Chemistry d and f Block Elements 2019 JEE Advanced 2019 (Paper 1)

JEE Advanced Chemistry Question (2019) — Solution

Question

Fusion of M n O 2 with K O H in presence of O 2 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)

Options

  1. A. Y is diamagnetic in nature while Z is paramagnetic
  2. B. Both Y and Z are coloured and have tetrahedral shape
  3. C. In both Y and Z , π -bonding occurs between p -orbitals of oxygen and d -orbitals of manganese.
  4. D. In aqueous acidic solution, Y undergoes disproportionation reaction to give Z and M n O 2 .

Answer

D. In aqueous acidic solution, Y undergoes disproportionation reaction to give Z and M n O 2 .

Step-by-step solution

M n O 2 + 2 KOH + 1 2 O 2 → Δ K 2 M n O 4 ( W ) + H 2 O Oxidation state + 6 Paramagnetic and green colored salt → shape : Tetrahedra of anion M n O 4 2- Purple coloured and tetrahedra shape

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