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Test: Electrochemical cells and Electrode Potential - JEE MCQ


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15 Questions MCQ Test - Test: Electrochemical cells and Electrode Potential

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Test: Electrochemical cells and Electrode Potential - Question 1

. In the construction of a salt bridge, saturated solution of KNO3 is used because:

Detailed Solution for Test: Electrochemical cells and Electrode Potential - Question 1

The correct answer is Option A.

For a good salt bridge, the velocities of ions should be the same. If the velocities are not the same, then the ions would not be able to neutralize the charge equally in both half cells. Consequently, an opposite force would be developed that restricts the flow of current. For KNO3, the velocities of K+and NO3- are nearly the same. Therefore, it is used to make salt bridges

Test: Electrochemical cells and Electrode Potential - Question 2

 During electrolysis, the reaction that takes place at anode is:

Detailed Solution for Test: Electrochemical cells and Electrode Potential - Question 2

The correct answer is Option D
oxidation
The reaction at the anode is oxidation and that at the cathode is reduction. The electrons are supplied by the species getting oxidized. They move from anode to the cathode in the external circuit.

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Test: Electrochemical cells and Electrode Potential - Question 3

 In an electrochemical cell, the electrode having a lower reduction potential will act as:

Detailed Solution for Test: Electrochemical cells and Electrode Potential - Question 3

The electrode having lower reduction potential will have lesser tendency to gain electrons.
i.e. act as anode.

Test: Electrochemical cells and Electrode Potential - Question 4
For an electrolyte solution of , the conductivity has been found to be . The molar conductivity is
Detailed Solution for Test: Electrochemical cells and Electrode Potential - Question 4

Test: Electrochemical cells and Electrode Potential - Question 5
Which of the following ion is expected to have highest value of molar conductivity at infinite dilution in the aqueous solution?
Detailed Solution for Test: Electrochemical cells and Electrode Potential - Question 5
Among the cations has the maximum conductivity due to grotthuss conduction.
Test: Electrochemical cells and Electrode Potential - Question 6

The specific conductivity of solution at is and the resistance of the cell containing this solution at is . The cell constant is

Detailed Solution for Test: Electrochemical cells and Electrode Potential - Question 6

Cell constant


Test: Electrochemical cells and Electrode Potential - Question 7

The standard reduction potential for is Calculate the reduction potential at for the above couple.

Detailed Solution for Test: Electrochemical cells and Electrode Potential - Question 7

When


The half cell reaction


Test: Electrochemical cells and Electrode Potential - Question 8
When electric current is passed through a cell having an electrolytic solution, the cations move towards the cathode and anions towards the anode. If anode is pulled out from the solution
Detailed Solution for Test: Electrochemical cells and Electrode Potential - Question 8
On pulling out one of the electrodes the electric field applied to the solution disappears and hence the ions start moving randomly.
Test: Electrochemical cells and Electrode Potential - Question 9
At a certain temperature and at infinite dilution, the equivalent conductances of sodium benzoate, hydrochloric acid and sodium chloride are 240, 349 and equiv respectively. The equivalent conductance of benzoic acid in equiv at the same conditions is
Detailed Solution for Test: Electrochemical cells and Electrode Potential - Question 9
Given, equiv
equiv
equiv


equiv
Test: Electrochemical cells and Electrode Potential - Question 10
(aq) is titrated with conductometrically, graphical representation of the titration is :
Detailed Solution for Test: Electrochemical cells and Electrode Potential - Question 10
Molar conductivity of and are very high as compare to other ions. Initially conductance of solution sharply decreases due to consumption of free . After complete neutralization further slightly increases due to presence of .
Test: Electrochemical cells and Electrode Potential - Question 11
If the resistance of solution in a conductance cell is and conductivity is , then the value of cell constant is
Detailed Solution for Test: Electrochemical cells and Electrode Potential - Question 11
Conductivity cell constant Cell constant
Given,
Cell constant .
Test: Electrochemical cells and Electrode Potential - Question 12

The resistance of solution of acetic acic is , when measured in a cell of cell constant . The equivalent conductance (in equiv ) of acetic acid will be

Detailed Solution for Test: Electrochemical cells and Electrode Potential - Question 12

Test: Electrochemical cells and Electrode Potential - Question 13
At , the conductivity of solutions of molarity and are recorded as and respectively. The correct relation between and is
Detailed Solution for Test: Electrochemical cells and Electrode Potential - Question 13
With the increase in concentration, conductivity of solution increases due to an increase in the number of ions.
Thus, .
Test: Electrochemical cells and Electrode Potential - Question 14

Which of the following statements is correct for the cell Zn ∣∣ Zn+2 ∥ Cu+2 ∣∣ Cu ?

Detailed Solution for Test: Electrochemical cells and Electrode Potential - Question 14

In the Daniell cell, copper and zinc electrodes are immersed in a solution of copper(II) sulphate and zinc sulphate, respectively.
At the anode (negative electrode), zinc is oxidised per the following half reaction.
Zn(s) ⟶ Zn2+(aq) + 2e
At the cathode (positive electrode), copper is reduced per the following reaction.
Cu2+ (aq) + 2e⟶ Cu(s)
Overall cell reaction is
Zn(s) + Cu2+(aq) ⟶ Zn2+(aq) + Cu(s)
These processes result in the accumulation of solid copper at the cathode and the corrosion of the zinc electrode into the solution as zinc cations. Hence, the correct option is (1).

Test: Electrochemical cells and Electrode Potential - Question 15
The corrosion of iron is essentially an electrochemical phenomenon. What are the cell reactions involving in the phenomenon?
Detailed Solution for Test: Electrochemical cells and Electrode Potential - Question 15

(anodic reaction)

(cathodic reaction)

The overall reaction is

may be dehydrated to iron oxide or further oxidized to and then dehydrated to iron rust, .

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