MCQ
Consider the reaction ${H_2}S{O_3}\left( {aq} \right) + S{n^{4 + }}\left( {aq} \right) + {H_2}O\left( l \right) \to S{n^{2 + }}\left( {aq} \right) + HSO_4^ - \left( {aq} \right) + 3{H^ + }\left( {aq} \right)$ Which of the following statements is correct?
  • A
    $Sn^{4+}$ is the oxidizing agent because it undergoes oxidation
  • B
    $Sn^{4+}$ is the reducing agent because it undergoes oxidatio 
  • $H_2SO_3$ is the reducing agent because it undergoes oxidation
  • D
    $H_2SO_3$ is the reducing agent because it undergoes reduction

Answer

Correct option: C.
$H_2SO_3$ is the reducing agent because it undergoes oxidation
c
$\mathop {{H_2}S{O_3}}\limits^{ + 4} (aq) + \mathop {Sn^{+4}} (aq) + {H_2}O(l) \to S{n^{2 + }}(aq) + \mathop {HS{O_4}^ - }\limits^{ + 6} (aq) + 3{H^ + }$ Hence $H_2SO_3$ is the reducing agent because it undergoes oxidation

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