Electrochemistry Test

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Electrochemistry Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements is true?

A
The reference calomel electrode is made from HgCl₂.

B
Electrolysis involves oxidation and reduction respectively at cathode and anode.

C
The standard electrode potential is measured by galvanometer.

D
KCl used in a salt bridge because velocities of K⁺ and Cl^- are nearly equal

Solution

Correct statement.
KCl used in a salt bridge because velocities of K⁺ and Cl^- are nearly equal.
Question 2
1 / -0

During the measurement of EMF of a half cell using a reference electrode and a salt bridge, if the salt bridge is removed, then the voltage

A
remains unchanged

B
decreases to half the previous value

C
increases to its maximum value

D
drops to zero or becomes negative

Solution

During the measurement of EMF of a half cell using a reference electrode and a salt bridge, if the salt bridge is removed, then the voltage drops to zero or becomes negative.
Question 3
1 / -0

In electrolysis of NaCl, when Pt electrode is taken, H₂ is liberated at cathode, while with Hg cathode, it forms sodium amalgam. Give the correct reason.

A
Hg is more inert than Pt.

B
More voltage is required to reduce H⁺ at Hg than at Pt.

C
Na is dissolved in Hg, while it does not dissolve in Pt.

D
Concentration of H⁺ ions is larger when Pt electrode is taken.

Solution

In electrolysis of NaCl, when Pt electrode is taken, H₂ is liberated at cathode, while with Hg cathode, more voltage is required to reduce H⁺.
Question 4
1 / -0

Which of the following statements is correct?

A
The equivalent conductance of both strong and weak electrolytes decreases with dilution.

B
The equivalent conductance of strong electrolytes increases with dilution, while that of weak electrolytes decreases with dilution.

C
The equivalent conductance of strong electrolytes decreases with dilution, while that of weak electrolytes increases with dilution.

D
The equivalent conductance of both strong and weak electrolytes increases with dilution.

Solution

The equivalent conductance of both strong and weak electrolytes increases with dilution. This is because with the increase in dilution (decrease in concentration), ions become farther apart, and inter-ionic forces (i.e. forces of attraction between unlike ions and forces of repulsion between like ions) decrease considerably, so that greater number of ions are able to migrate to the electrodes. In addition, due to change in equilibrium, the electrolyte undergo further ionisation from the same mass in solution (in order to balance the effect).
Question 5
1 / -0

What is the SI unit of molar conductivity?

A
S m^-1mol²

B
m²mol S^-1

C
S² m mol^-1

D
S m²mol^-1

Solution

The SI unit of molar conductivity is S m² mol^-1.

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Electrochemistry Test - 5

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Electrochemistry Test - 5

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Question 1

The reference calomel electrode is made from HgCl2.

Electrolysis involves oxidation and reduction respectively at cathode and anode.

The standard electrode potential is measured by galvanometer.

KCl used in a salt bridge because velocities of K+ and Cl- are nearly equal

Solution

Question 2

remains unchanged

decreases to half the previous value

increases to its maximum value

drops to zero or becomes negative

Solution

Question 3

Hg is more inert than Pt.

More voltage is required to reduce H+ at Hg than at Pt.

Na is dissolved in Hg, while it does not dissolve in Pt.

Concentration of H+ ions is larger when Pt electrode is taken.

Solution

Question 4

The equivalent conductance of both strong and weak electrolytes decreases with dilution.

The equivalent conductance of strong electrolytes increases with dilution, while that of weak electrolytes decreases with dilution.

The equivalent conductance of strong electrolytes decreases with dilution, while that of weak electrolytes increases with dilution.

The equivalent conductance of both strong and weak electrolytes increases with dilution.

Solution

Question 5

S m-1 mol2

m2 mol S-1

S2 m mol-1

S m2 mol-1

Solution

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The reference calomel electrode is made from HgCl₂.

KCl used in a salt bridge because velocities of K⁺ and Cl^- are nearly equal

More voltage is required to reduce H⁺ at Hg than at Pt.

Concentration of H⁺ ions is larger when Pt electrode is taken.

S m^-1mol²

m²mol S^-1

S² m mol^-1

S m²mol^-1