Which of the following samples of reducing agents is/are chemically equivalent to 25 mL of 0.2 N KMnO4 to be reduced to Mn2 + and water.
(A) 25 mL of 0.2 M FeSO4 to be oxidized to Fe3 +
(B) 50 mL of 0.1 M H3AsO3 to be oxidized to H3AsO4
‚Äč(C) 25 mL of 0.1 M H2O2 to be oxidized to H+ and O2
(D) 25 mL of 0.1 M SnCl2 to be oxidized to Sn4 +

Option a and d is correctNormality = Molarity × n factorV1N1 of KMnO4 = 25 × 0.2 = 5 a) 25 ml of 0.2 M FeSO4 is oxidised to Fe3+. This means n = 1 So V1N1 of FeSO4 = 25 × 0.2 × 1 = 5 d) 25 ml of 0.1  M SnCl2 is oxidised to Sn4+. This means n = 2 So V1N1 of FeSO4 = 25 × 0.1 × 2 = 5 

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