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JIPMER2015ChemistryElectrochemistry

Point out the incorrect reaction from the following.

Options

  1. A2 Na ₂ CrO ₄+ H ⁺ Na ₂ Cr ₂ O ₇+2 Na ⁺+ H ₂ O
  2. B4 MnO ₂+4 KOH + O ₂ 4 KMnO ₄+2 H ₂ O
  3. Caligned 2 MnO ₄⁻+5 C ₂ O ₄²⁻+16 H ⁺ 2 Mn ²⁺+10 CO ₂+8 H ₂ O aligned

Correct answer

B. 4 MnO ₂+4 KOH + O ₂ 4 KMnO ₄+2 H ₂ O

Step-by-step solution

Pyrolusite ore, MnO ₂ on fusion with KOH in presence of air forms potassium manganate, K ₂ MnO ₄2 MnO ₂+4 KOH + O ₂ 2 ~K ₂ MnO ₄+2 H ₂ O

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