Electrochemical Cells

IMPORTANT

Electrochemical Cells: Overview

This topic covers concepts, such as, Voltaic Cell or Galvanic Cell, Electrochemical Cell, Salt Bridge & Applications of a Salt Bridge etc.

Important Questions on Electrochemical Cells

HARD
IMPORTANT

A cell, Ag|A g + C u 2+ |Cu, initially contains 1 M A g +  and 1   MC u 2+ ions.

Calculate the change in the cell potential after the passage of 9.65 A of current for 1 h.

HARD
IMPORTANT

How many grams of silver could be plated out on a serving tray by electrolysis of a solution containing silver in +1 oxidation state for a period of 1.0 hours at a current of 8.46 amperes? What is the area of the tray if the thickness of the silver plating is 0.00254 cm? Density of silver is 10.5gc m 3 .

MEDIUM
IMPORTANT

The reaction :

 12H2(g)+AgCl (s)H+(aq)+Cl(aq)+Ag (s)  occurs in the galvanic cell

MEDIUM
IMPORTANT

The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at   25°C.  The equilibrium constant of reaction would be –

HARD
IMPORTANT

The no. of cells which may be constructed with different ECell° values for the reaction: Fe+2Fe3+3Fe2+

EASY
IMPORTANT

The first cell made in the world is _____. (Voltaic cell/ Nickel-Cadmium cells)

MEDIUM
IMPORTANT

Galvanic cells convert electrical energy into chemical energy.

MEDIUM
IMPORTANT

Secondary battery is a cell which can be _____  repeatedly for use. Examples are Lithium-ion battery, Lead Storage battery, etc.

EASY
IMPORTANT

Daniell cell having electrodes of zinc and copper dipping in the solutions of their respective salts, electrons flow from negative electrode to positive electrode.

MEDIUM
IMPORTANT

Daniell cell having electrodes of zinc and copper dipping in the solutions of their respective salts, zinc electrode is acting as a cathode and copper electrode is acting as anode.

EASY
IMPORTANT

Galvanic cells converts electrical energy into chemical energy.

MEDIUM
IMPORTANT

A variable, opposite external potential (Eext) is applied to the cell

ZnZn2+ (1 M) || Cu2+ (1 M)  Cu, of potential 1.1 V. When Eext<1.1 V and Eext >1.1 V, respectively electrons flow from :

MEDIUM
IMPORTANT

Define electrochemical cell. What happens if external potential applied becomes greater than E°cell  of electrochemical cell?

MEDIUM
IMPORTANT

In a galvanic cell, the salt bridge

EASY
IMPORTANT

Which of the following statements is false?
 

HARD
IMPORTANT

Explain how salt-bridge maintains the electrical neutrality of the two half cell solutions in a galvanic cell?

HARD
IMPORTANT

(a) Represent the galvanic cell based on the cell reaction given below : Cu(s)+2Ag+(aq) Cu2+ (aq)+2Ag (s).

(b) Write the half cell reactions of the above cell.

EASY
IMPORTANT

What are the functions of salt bridge in a galvanic cell?

MEDIUM
IMPORTANT

Write two points of differences between galvanic cell and electrolytic cell?

HARD
IMPORTANT

What is a Galvanic cell? Give the function of salt bridge?