Question
Question: In which of the following electrochemical cell overall cell reaction is : HgO (s) + H<sub>2</sub> (...
In which of the following electrochemical cell overall cell reaction is :
HgO (s) + H2 (g) → Hg (l) + H2O (l)
A
Pt | H2 (g) | H+ (aq) | HgO (s) | Hg (l) | Pt
B
Pt | H2 (g) | NaOH (aq) | HgO (s) | Hg (l) |Pt
C
Pt | H2 (g)|H+||NaOH (aq)|HgO (s) | Hg (l) | Pt
D
Pt | H2 (g) | H+ || HgO (s) | Hg (l) | Pt
Answer
Pt | H2 (g) | NaOH (aq) | HgO (s) | Hg (l) |Pt
Explanation
Solution
Pt | H2 (g) | NaOH (aq) | HgO (s) | Hg (l) | Pt
LHE reaction : H2 (g) + 2OH– → 2H2O (ll) + 2e
RHE reaction : HgO (s) + H2O (l) + 2e → Hg (l) + 2OH–
Net cell reaction : HgO (s) + H2 (g) → Hg (l) + H2O