chemistry : class12 Effect of Dilution : Conductance in electrolytic solutions : Electrochemistry MCQ Questions and Answers
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Effect of Dilution
MCQ questions and answers.
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MCQ Questions
1. What happens to the conductivity of an electrolytic solution when it is diluted?
A.
It generally decreases
B.
It always increases
C.
It remains unchanged
D.
It becomes zero immediately
Correct Answer:
It generally decreases
Explanation:
On dilution, the number of ions per unit volume decreases, so the conductivity of the solution generally decreases.
2. What happens to the molar conductivity of an electrolyte solution on dilution?
A.
It generally increases
B.
It always decreases
C.
It remains constant
D.
It becomes zero
Correct Answer:
It generally increases
Explanation:
Molar conductivity increases on dilution because ions move more freely and, especially for weak electrolytes, ionization increases.
3. The increase in molar conductivity on dilution is much greater for which type of electrolyte?
A.
Weak electrolytes
B.
Strong electrolytes
C.
Non-electrolytes
D.
Metallic conductors
Correct Answer:
Weak electrolytes
Explanation:
Dilution greatly increases the ionization of weak electrolytes, causing a large increase in their molar conductivity.
4. Why does the molar conductivity of a strong electrolyte increase only slightly on dilution?
A.
It is already almost completely ionized
B.
It produces no ions in solution
C.
Its ions disappear on dilution
D.
Its concentration increases on dilution
Correct Answer:
It is already almost completely ionized
Explanation:
Strong electrolytes are nearly completely ionized even in concentrated solutions, so dilution mainly produces a small increase in ionic mobility.
5. On dilution, the degree of ionization of a weak electrolyte generally:
A.
Increases
B.
Decreases
C.
Remains exactly zero
D.
Becomes independent of concentration
Correct Answer:
Increases
Explanation:
Dilution shifts the ionization equilibrium of a weak electrolyte toward the formation of more ions, increasing its degree of ionization.
6. Which quantity decreases when a solution is diluted, although its molar conductivity increases?
A.
Conductivity
B.
Degree of ionization
C.
Molar conductivity
D.
Number of ions produced per mole
Correct Answer:
Conductivity
Explanation:
Dilution reduces the number of ions present per unit volume, so conductivity decreases, while molar conductivity increases.
7. At infinite dilution, the molar conductivity of an electrolyte is called:
A.
Limiting molar conductivity
B.
Specific resistance
C.
Cell constant
D.
Equivalent resistance
Correct Answer:
Limiting molar conductivity
Explanation:
The molar conductivity attained when the solution is diluted to infinite dilution is called limiting molar conductivity.
8. For a weak electrolyte, dilution increases molar conductivity mainly because:
A.
The number of ions formed increases
B.
The solution becomes more concentrated
C.
The ions become neutral molecules
D.
The volume of each ion decreases
Correct Answer:
The number of ions formed increases
Explanation:
Weak electrolytes ionize more on dilution, increasing the number of charge-carrying ions and hence the molar conductivity.
9. When a strong electrolyte solution is diluted, the attraction between its ions generally:
A.
Decreases
B.
Increases greatly
C.
Becomes infinite
D.
Changes the ions into atoms
Correct Answer:
Decreases
Explanation:
Dilution increases the distance between ions, reducing interionic attraction and allowing greater ionic movement.
10. Which statement correctly describes the effect of dilution on an electrolytic solution?
A.
Conductivity decreases, while molar conductivity increases
B.
Both conductivity and molar conductivity decrease
C.
Conductivity increases, while molar conductivity decreases
D.
Both conductivity and molar conductivity remain unchanged
Correct Answer:
Conductivity decreases, while molar conductivity increases
Explanation:
Dilution lowers the number of ions per unit volume, decreasing conductivity, but increases the conductance of the ions associated with one mole of electrolyte, increasing molar conductivity.
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Effect of Dilution
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