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Test: Cells and Electrode Potential - JEE MCQ


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15 Questions MCQ Test - Test: Cells and Electrode Potential

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Test: Cells and Electrode Potential - Question 1

An electrolytic cell contains a solution of and has platinum electrodes. A current is passed until of has been liberated at anode. The amount of silver deposited at cathode would be

Detailed Solution for Test: Cells and Electrode Potential - Question 1

Wt. of
Test: Cells and Electrode Potential - Question 2

 A standard hydrogen electrode has zero electrode potential because

Detailed Solution for Test: Cells and Electrode Potential - Question 2

The standard potential of hydrogen electrode is assumed to be zero at all temperature.

The Standard hydrogen electrode (abbreviated SHE), is a redox electrode which forms the basis of the thermodynamic scale of oxidation-reduction potentials. Its absolute electrode potential is estimated to be 4.44 ± 0.02 V at 25 °C, but to form a basis for comparison with all other electrode reactions, hydrogen's standard electrode potential (E0) is declared to be zero volts at all temperatures.

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Test: Cells and Electrode Potential - Question 3

In Daniel cell, oxidation takes place at

Detailed Solution for Test: Cells and Electrode Potential - Question 3

The solutions in which the electrodes are immersed are called electrolytes. The chemical reaction that takes placein a galvanic cell is the redox reaction. One electrode acts as anode in whichoxidation takes place and the other acts as the cathode in which reductiontakes place.the half-cell occurs is called reduction half-cell and the reaction taking place in it is called reduction half-cell reaction. The electrode where oxidation occurs is called anode and the electrode where reduction occurs is termed cathode. Electrons flow from anode to cathode in the external circuit.

Test: Cells and Electrode Potential - Question 4

 A standard hydrogen electrode has zero electrode potential because

Detailed Solution for Test: Cells and Electrode Potential - Question 4

The standard potential of hydrogen electrode is assumed to be zero at all temperature.

The Standard hydrogen electrode (abbreviated SHE), is a redox electrode which forms the basis of the thermodynamic scale of oxidation-reduction potentials. Its absolute electrode potential is estimated to be 4.44 ± 0.02 V at 25 °C, but to form a basis for comparison with all other electrode reactions, hydrogen's standard electrode potential (E0) is declared to be zero volts at all temperatures.

Test: Cells and Electrode Potential - Question 5

A cell is prepared by dipping a chromium rod in 1M Cr2(SO4)3 solution and an iron rod in 1M FeSO4 solution. The standard reduction potentials of Chromium and Iron electrodes are -0.75 V and -0.45 V respectively. What will be the standard EMF of the cell?

Detailed Solution for Test: Cells and Electrode Potential - Question 5

Reduction potential of fe is more than that of cr, so fe will reduce and act as cathode and cr will act as anode. now emf of cell is reduction potential of cathode - reduction potential of anode. so EMF= -0.45-(-0.75) = 0.3 V

Test: Cells and Electrode Potential - Question 6

A gas X at 1 atm is bubbled through a solution containing a mixture of 1MY and MZ at 25C. If the reduction potential of Z > Y > X, then,

Detailed Solution for Test: Cells and Electrode Potential - Question 6

The given order of reduction potentials (or tendencies) is Z > Y > X. A spontaneous reaction will have the following characteristics Z reduced and Y oxidised Z reduced and X oxidised Y reduced and X oxidised Hence, Y will oxidise X and notZ.

Test: Cells and Electrode Potential - Question 7

On the basis of the following values, the strongest oxidizing agent is:

Detailed Solution for Test: Cells and Electrode Potential - Question 7

From the given data we find is strongest oxidising agent. More the positive value of , more is the tendency to get oxidized. Thus correct option is (c).

Test: Cells and Electrode Potential - Question 8
The variation of molar conductance of strong electrolyte with (concentration) is represented by
Detailed Solution for Test: Cells and Electrode Potential - Question 8
In case of molar conductance of strong electrolyte there is little increase with dilution.
Test: Cells and Electrode Potential - Question 9
The standard EMF of Daniell cell is volt. The maximum electrical work (in ) obtained from the Daniell cell is
Detailed Solution for Test: Cells and Electrode Potential - Question 9
.
Test: Cells and Electrode Potential - Question 10

Kohlrausch's law states that at:

Detailed Solution for Test: Cells and Electrode Potential - Question 10

At infinite dilution, when dissociation is complete each ion makes a definite contribution towards molar conductance of the electrolyte irrespective of the nature of the other ion with which it is associated and that the molar conductance of any electrolyte at infinite dilution is given by the sum of the contributions of two ions. This is called Kohlrausch's law.

are molar ionic conductance at infinite dilution for cations and anions, respectively.

Test: Cells and Electrode Potential - Question 11

The standard for the given cell reaction, is at . The for the cell reaction, when and solutions are used, at , is

(Use )

Detailed Solution for Test: Cells and Electrode Potential - Question 11

For the reaction:



Test: Cells and Electrode Potential - Question 12

The standard reduction potentials at for the following half reactions are given against each


Which is the strongest reducing agent?

Detailed Solution for Test: Cells and Electrode Potential - Question 12

Since oxidation potential of is highest hence strongest reducing agent.

Test: Cells and Electrode Potential - Question 13
A smuggler could not carry gold by depositing iron on the gold surface since
Detailed Solution for Test: Cells and Electrode Potential - Question 13
Gold having higher and oxidises
Gold has a reduction potential .
Iron has a reduction potential .
Thus, gold has a higher reduction potential than iron.
An element with a higher reduction potential is a stronger oxidizing agent.
So, gold is a stronger oxidizing agent than iron.
Hence, gold will get reduced itself instead of iron.
Therefore, iron can not be deposited on the gold surface.
Test: Cells and Electrode Potential - Question 14
Standard electrode potential for couple is and that for the couple is . These two couples in their standard state are connected to make a cell. The cell potential will be:
Detailed Solution for Test: Cells and Electrode Potential - Question 14
Given


Test: Cells and Electrode Potential - Question 15

A solution contains Fe2+, Fe3+ and I ions. This solution was treated with iodine at 35C.E for Fe3+/Fe2+ is +0.77 V and E∘ for I2/2I− = 0.536 V
The favourable redox reaction is :

Detailed Solution for Test: Cells and Electrode Potential - Question 15

Given
and






So, reaction will take place.

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