Standard Reduction Potentials Question

[zorro]

Homework Statement

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.

 

[Nino MMP]

Homework EquationsNoneThe Attempt at a Solutiona) Cu2+ ions can be reduced by H2(g) - Correctb) Cu can be oxidised by H+ - Incorrect (Cu is already in the +2 oxidation state, so it cannot be oxidized any further)c) Sn2+ ions can be oxidised by H2(g) - Incorrect (Sn has a more negative reduction potential than H2, so it cannot be oxidized by H2)d) Cu can reduce Sn2+ - Correct