Which of the following is spontaneous?

Question

Zn²⁺ → Zn (s) ; E⁰ = - 0.76 V

Cu²⁺ → Cu(s) ; E⁰ = - 0.34 V

Which of the following is spontaneous?

(a) Zn²⁺ + Cu → Zn +Cu²⁺

(b) Cu²⁺ + Zn → Cu + Zn²⁺

(c) Zn²⁺ + Cu²⁺ → Zn + Cu

(d) None of these

Answer 1

Correct option: (b) Cu²⁺ + Zn → Cu + Zn²⁺

^Explanation:

For spontaneous reaction E⁰_cell must be positive.

Here Cu acts as cathode and zinc acts as anode.