Electrode Potentials Question

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Which of the following statements is correct if
Standard reduction potentials of Cu and Sn are 0.337V and -0.136V resp. (both from +2 charge)

a) Cu²⁺ ions can be reduced by H₂(g)
b) Cu can be oxidised by H⁺
c) Sn²⁺ ions can be oxidised by H₂(g)
d) Cu can reduce Sn²⁺

I am confused between reduction/oxidation of ions/metals by H2 or H+. I don't have any idea of correctly employing the given reduction potential values in each case. I tried and deduced that c) and d) must be incorrect. No idea about a) and b)

Please provide me clear explanation of this.
Thanks in advance.

#Chemistry #Physical Chemistry

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2 Answers

qwerty ·2010-12-28 08:14:10

Cu²⁺+2e^- â†’ Cu, Î”G₁

2H⁺+2e^- â†’ H₂ ,Î”G₂

reaction 1 - 2 gives

Cu²⁺ + H₂ â†’ Cu + 2H⁺,Î”G = Î”G₁-Î”G₂

if Î”G < 0 , reaction is favourable

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swordfish ·2010-12-28 12:08:21

Thanks!

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Electrode Potentials Question

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