Consider the reaction : H 2 SO 3 aq + Sn aq 4 + + H 2 O l ⁡ → Sn aq 2 + + HSO 4 aq - + 3 H aq +…

Consider the reaction :

H 2 SO 3 aq + Sn aq 4 + + H 2 O l Sn aq 2 + + HSO 4 aq - + 3 H aq +

Which of the following statements is correct ?
  1. Sn4+ is the oxidizing agent because it undergoes oxidation
  2. Sn4+ is the reducing agent because it undergoes oxidation
  3. H2SO3 is the reducing agent because it undergoes reduction
  4. H2SO3 is the reducing agent because it undergoes oxidation

Solution

  Identify oxidation states of all elements in Redox Reaction

H2SO+43+Sn4++H2O(l)Sn2++HSO4- +6 +3H+

S is changing the oxidation state from (+4) to (+6). i.e H2SO3 is a Reducing agent because it undergoes oxidation.

Asked in: JEE Main 2014 (19 Apr Online)

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