Which of the following oxidation-reduction reactions will be spontaneous in the

Question

Which of the following oxidation-reduction reactions will be spontaneous in the direction written? Zn^2+ (aq) + Cu (s) rightarrow Zn (s) + Cu^2+ (aq) Mg^2+ (aq) + Be (s) rightarrow Mg (s) + Be^2+ (aq) Hg^2+ (aq) + Cu (s) rightarrow Hg (s) + Cu^2+ (aq) Pb^2+ (aq) + Cu (s) rightarrow Pb (s) + Cu^2+ (aq) Fe^2+ (aq) + Pb (s) rightarrow Fe (s) + Pb^2+ (aq) When the following oxidation-reduction reaction is correctly balanced in acid solution, how many electrons are transferred? PbO_2 (aq) + Ag (s) rightarrow Pb^2+ (aq) + Ag^+ (aq)

Explanation / Answer

30.

The spontaneous oxidation-reduction reaction in the direction written below would be,

Hg^2+ + Cu --> Hg(s) + Cu2+

31.

Balancing the given equations, involves

2 electrons

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