Electrochemistry Test

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Electrochemistry Test - 5

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Question 1/5
1 / -0

Which of the following statements is true?

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A
The reference calomel electrode is made from HgCl₂.

Correct

Wrong

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

Correct

Wrong

Skipped
C
The standard electrode potential is measured by galvanometer.

Correct

Wrong

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

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Solutions

Correct statement.
KCl used in a salt bridge because velocities of K⁺ and Cl^- are nearly equal.
Question 2/5
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

Correct

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A
remains unchanged

Correct

Wrong

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B
decreases to half the previous value

Correct

Wrong

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C
increases to its maximum value

Correct

Wrong

Skipped
D
drops to zero or becomes negative

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Solutions

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 3/5
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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.

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A
Hg is more inert than Pt.

Correct

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

Correct

Wrong

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

Correct

Wrong

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

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Solutions

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 4/5
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Which of the following statements is correct?

Correct

Wrong

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

Correct

Wrong

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

Correct

Wrong

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

Correct

Wrong

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

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Solutions

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 5/5
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What is the SI unit of molar conductivity?

Correct

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A
S m^-1mol²

Correct

Wrong

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B
m²mol S^-1

Correct

Wrong

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C
S² m mol^-1

Correct

Wrong

Skipped
D
S m²mol^-1

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Solutions

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

Question 1/5

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

Question 2/5

remains unchanged

decreases to half the previous value

increases to its maximum value

drops to zero or becomes negative

Question 3/5

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.

Question 4/5

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.

Question 5/5

S m^-1mol²

m²mol S^-1

S² m mol^-1

S m²mol^-1

Question 1/5

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

Question 2/5

remains unchanged

decreases to half the previous value

increases to its maximum value

drops to zero or becomes negative

Question 3/5

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.

Question 4/5

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.

Question 5/5

S m-1 mol2

m2 mol S-1

S2 m mol-1

S m2 mol-1

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