Electrochemistry Test

Result

Electrochemistry Test - 30

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Weekly Quiz Competition

Question 1
4 / -1

In a galvanic cell, the salt bridge

A
does not participate chemically in the cell reaction

B
stops the diffusion of ions from one electrode to another

C
is necessary for the occurrence of the cell reaction

D
ensure moving of the two electrolyte solution
Question 2
4 / -1

The standard reduction potential data at 25^oC is given below
E^o(Fe³⁺/Fe²⁺) = 0.77V
E^o(Fe²⁺/Fe) = -0.44V
E^o(Cu²⁺?Cu) = + 0.34 V
E^o(Cu⁺/Cu) = + 0.52 V
E^o (O₂(g) + 4H⁺ + 4e^-→2H₂O) = 1.23 V
E^o (O₂ (g) + 2H₂O + 4e^- →4OH^-) = + 0.40 V
E^o (Cr³⁺/Cr) = -0.74 V;
E^o(Cr²⁺/Cr) = -0.91 V
Match E^o of the redox pair in List I with the values given in List II and select the correct answer using the codes given below the lists

A
P = 4, Q = 1, R = 2, S = 3

B
P = 2, Q = 3, R = 4, S = 1

C
P = 1, Q = 2, R = 3, S = 4

D
P = 3, Q = 4, R = 1, S = 2
Question 3
4 / -1

The standard reduction potential for Zn²⁺/Zn, Ni²⁺ /Ni and Fe²⁺/Fe are - 0.76, - 0.23 and - 0.44 V respectively. The reaction X + Y²⁺ → X²⁺ + Y will be spontaneous when

A
X = Ni, Y = Fe

B
X = Ni, Y = Zn

C
X = Fe, Y = Zn

D
X = Zn, Y = Ni
Question 4
4 / -1

A
– 1.08 volts

B
– 0.40 volts

C
1.08 volts

D
2.50 Volts

Solution
Question 5
4 / -1

The standard oxidation potential of zinc and silver in water at 298 K are
Zn(s) → Zn²⁺ + 2e^–, E = 0.76V, Ag(s) → Ag⁺ + e^–, E = –0.80V
which of the following reactions actually takes place?

A
Zn(s) + 2Ag⁺(aq) → Zn²⁺(aq) + 2Ag(s)

B
Zn²⁺ + 2Ag(s) → 2Ag⁺(s) + Zn(s)

C
Zn(s) + Ag(s) → Zn²⁺(aq) + Ag⁺(aq)

D
Zn²⁺(aq) + Ag⁺(aq) → Zn(s) + Ag(s)
Question 6
4 / -1

The electric charge for electrode deposition of one gram equivalent of substance is

A
one ampere for one second

B
956500 coulombs per second

C
charge on one mole of electrons

D
one ampere for one hour
Question 7
4 / -1

The one that is a good conductor of electricity in the following list of solids is

A
Sodium chloride

B
Graphite

C
Diamond

D
Sulphur
Question 8
4 / -1

A

B

C

D
Question 9
4 / -1

Which one of the following will increase the voltage of the cell
Sn(s) + 2Ag⁺(aq) → Sn²⁺(aq) + 2Ag(s)?

A
Increase in the size of the silver rod

B
Increase in the concentration of Sn²⁺ ions

C
Increase in the concentration of Ag⁺ ions

D
None of the above.

Solution
Question 10
4 / -1

If same amount of electricity is passed through aqueous solution of AgNO₃ and CuSO₄ and the number of Ag and Cu atoms deposited are x and y respectively. Then.

A
x = y

B
x < y

C
y = 2x

D
x = 2y