Electrochemistry

Question 1

Simultaneous occurence of oxidation and reduction reactions

Answer 1

Redox reaction

Question 2

Two devices used for carrying electrochemical charges

Answer 2

1.electrochemical cell
2.electrolytic cell

Question 3

Define electrode potential.

Question 4

What is a single electrode or half cell?

Question 5

Capacity of an electrode to lose electrons

Question 6

Capacity of an electrode to gain electrons

Question 7

According to IUPAC what is generally considered as default electrode potential?

Question 8

Define null electrode.

Question 9

Define standard electrode potential E⁰.

Question 10

What is cell potential? What is it’s unit ? It’s is also called ? Write it’s equation.

Answer 10

Potential difference between cathode and anode. It’s unit is volt. It is also called electromotive force of the cell or EMF. It equation is :
E⁰cell = E⁰cathode - E⁰anode.

Question 11

Write the alternate equations for EMF.

Answer 11

EMF = reduction potential of cathode - reduction potential of anode.
EMF = oxidation potential of anode - oxidation potential of cathode.
EMF = oxidation potential of anode + reduction potential of cathode.

Question 12

EMF depends on?

Answer 12

Nature of metal and ions.
Concentration of metal and ions in solution.

Question 13

The reversible work done by a galvanic cell is equal to ?

Answer 13

It’s decrease in Gibbs energy.

Question 14

Gibbs energy formulas?

Answer 14

∆G = -nFE⁰cell
∆G = RT log k

Question 15

When EMF is positive the cell reaction is feasible . when EMF is negative the cell reaction is not feasible. When EMF is zero the cell reaction is in equilibrium.

Answer 15

E⁰cell is Intensive parameter
∆G is an extensive parameter.