Standard potentials (Eº) for some half-reactions are given below : (I) Sn 4+ + 2 e ^ - →…
Chemistry · JEE Advanced · NTA Exams — Electrochemistry
Standard potentials (Eº) for some half-reactions are given below :
(I) Sn4+ + \(2 \mathrm{e}^{-}\) \(\text { → }\) Sn2+ ; Eº = + 0.15 V
(II) 2Hg2+ + \(2 \mathrm{e}^{-}\)\(\text { → }\) \(\mathrm{Hg}_{2}^{2+}\); Eº = 0.92 V
(III) PbO2 + 4H+ + \(2 \mathrm{e}^{-}\) \(\text { → }\) Pb2+ + 2H2O; Eº = + 1.45 V
based on the above, which one of the following statements is correct ?
(I) Sn4+ + \(2 \mathrm{e}^{-}\) \(\text { → }\) Sn2+ ; Eº = + 0.15 V
(II) 2Hg2+ + \(2 \mathrm{e}^{-}\)\(\text { → }\) \(\mathrm{Hg}_{2}^{2+}\); Eº = 0.92 V
(III) PbO2 + 4H+ + \(2 \mathrm{e}^{-}\) \(\text { → }\) Pb2+ + 2H2O; Eº = + 1.45 V
based on the above, which one of the following statements is correct ?
- Sn4+ is a stronger oxidising agent than Pb4+
- Sn2+ is a stronger reducing agent than Hg22+
- Pb2+ is a stronger oxidising agent than Pb4+
- Pb2+ is a stronger reducing agent than Sn2+
Answer
(B) Sn 2+ is a stronger reducing agent than Hg 2 2+
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