☰
✕

Electrochemistry
Question
Wired Faculty App

A hypothetical electrochemical cell is shown below
A- | A+ (xM)|| B+ (yM)|B+

The emf measured is +0.20 V. The cell reaction is:

  • A+ + B  →  A + B+

  • A+ + e-  →  A ; B+ + e-  → B-

  • the cell reaction cannot be predicted

  •  A+ + B  →  A+ + B

Answer

D.

 A+ + B  →  A+ + B

Electrochemical cell
A0 | A+ (xM) ||B+ yM) B+
The emf of cell is +.20 V. so cell reaction  is possible. The half  cell reaction are given as follows:


(i) At negative pole:
A → A+ + e- (oxidation)
(ii) At positive pole:
B+ + e-  → B  (reduction)
Hence, Cell reaction is
A +B- → A+ + B-, Ecello = + 0.20 V

Sponsor Area

Some More Questions From Electrochemistry Chapter

Why does the conductivity of a solution decrease with dilution?

Suggest a way to determine the Λ°m value of water.

The molar conductivity of 0.025 mol L–1 methanoic acid is 46.1 S cm2 mol–1. Calculate its degree of dissociation and dissociation constant. Give λ°(H+) = 349.6 S cm2 mol–1 and λ° (HCOO– ) = 54.6 s cm2 mol–1.

If the current of 0.5 ampere flows through a metallic wire for 2 hours, then how many electrons flow through the wire?

Suggest a list of metals that are extracted electrolytically.

Consider the reaction: Cr2O72– + 14H+ + 6e- → 2Cr3+ + 8H2O
What is the quantity of electricity in coulombs needed to reduce 1 mol of Cr2O72-?

Write the chemistry of recharging the lead storage battery, highlighting all the materials that are involved during recharging.

Suggest two materials other than hydrogen that can be used as fuels in fuel cells.