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.
