Thank you acs.org 40. What is the standard reduction potential of Hg(aq) to Hg(!

Question

Thank you acs.org 40. What is the standard reduction potential of Hg(aq) to Hg(!)? E, V 2 Hg(aq)2e ->Hg2 (a) 0.90 +0.80 Half Reaction Hg22+(aq) + 2e, 2 Hg(1) (A) +1.70 v (C) +0.10 V (B) +0.85 V (D) -0.10 V 41. The lead-acid storage battery consists of the following two half-cells: Pb02(s)+4 H(aq)+SO4(aq) +2e - PbSo4(s)+2 H O0) Which of the following concentrations decrease as the Pb(s) + SO4 (aq) -» PbSO4(s) +2 e battery is discharged? I. [H (A) I only (C) Both I and II II. [Pb2 (B) II only (D) Neither I nor II

Explanation / Answer

The overall reaction during discharging is given by adding the given two half cell reaction

Pb(s) + PbO2(s) + 2H2SO4(aq) = 2PbSO4(s)+ 2H2O(l)

hence as evident from the final reaction niether concentration is decreasing.

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