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AP EAMCET201922 Apr 2019Morning ShiftChemistryRedox ReactionsActual

Aqueous sulphite reacts with dilute sulphuric acid to form (X(g) ). The liberated (X(g) ) is passed into acidified ( KMnO ₄ ) solution. What is the oxidation state of ( Mn ) in the product formed?

Options

  1. A+6
  2. B+4
  3. C+2
  4. D+3

Correct answer

C. +2

Step-by-step solution

Aqueous sulphite when reacts with sulphuric acid, it gives ( SO ₂(g) ) which when react (passed) with acidified ( KMnO ₄ ) gives ( Mn ²⁺ ) ions as follows: (i) ( SO ₃²⁻+ H ₂ SO ₄ SO ₄²⁻+ SO ₂+ H ₂ O ) (ii) (5 SO ₂+2 KMnO ₄+2 H ₂ O K ₂ SO ₄ ) (+2 MnSO ₄+2 H ₂ SO ₄ ) ( ) Oxidation state of ( Mn ) in ( MnSO ₄ ) is +2. Hence, option (c) is the correct answer.

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