Redox Reactions And Electrochemistry Ques 345

Question: In a cell that utilizes the reaction; $ Zn(s)+2{H^{+}}(aq.)\to Z{n^{2+}}(aq)+H_2(g), $ addition of $ H_2SO_4 $ to cathode compartment will

Options:

A) increase the E and shift equilibrium to the left

B) lower the E and shift equilibrium to the right

C) increase the E and shift equilibrium to the right

D) lower the E and shift equilibrium to the left

Show Answer

Answer:

Correct Answer: C

Solution:

[c] $ Zn(s)+2{H^{+}}(aq)\rightarrow Z{n^{2+}}(aq)+H_2(g) $ $ E_{cell}=E_{cell}^{o}-\frac{0.059}{2}\log \frac{[Z{n^{2+}}][H_2]}{{{[H^{2}]}^{2}}} $

Addition of $ H_2SO_4 $ will increase $ [{H^{+}}] $ and $ E_{cell} $ will also increase and the equilibrium will shift towards right.



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