chemistry : class12 Resistance of Electrolyte : Conductance in electrolytic solutions : Electrochemistry MCQ Questions and Answers
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Resistance of Electrolyte
MCQ questions and answers.
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MCQ Questions
1. The resistance of an electrolyte solution is given by which relation?
A.
R = ρA/l
B.
R = ρl/A
C.
R = l/(ρA)
D.
R = A/(ρl)
Correct Answer:
R = ρl/A
Explanation:
The resistance R of an electrolyte solution is directly proportional to its resistivity ρ and length l, and inversely proportional to its cross-sectional area A.
2. What is the SI unit of resistance of an electrolyte solution?
A.
Ohm
B.
Siemens
C.
Ohm metre
D.
Siemens metre
Correct Answer:
Ohm
Explanation:
Resistance is measured in ohms, represented by the symbol Ω.
3. If the length of an electrolyte column is doubled while its area and resistivity remain unchanged, its resistance becomes
A.
Half
B.
Double
C.
Four times
D.
Unchanged
Correct Answer:
Double
Explanation:
Since R = ρl/A, resistance is directly proportional to the length of the electrolyte column.
4. If the cross-sectional area of an electrolyte column is doubled while its length and resistivity remain unchanged, its resistance becomes
A.
Double
B.
Four times
C.
Half
D.
Unchanged
Correct Answer:
Half
Explanation:
According to R = ρl/A, resistance is inversely proportional to the cross-sectional area.
5. The resistance of an electrolyte solution is measured using which instrument?
A.
Thermometer
B.
Voltmeter only
C.
Conductivity cell
D.
Calorimeter
Correct Answer:
Conductivity cell
Explanation:
A conductivity cell containing two electrodes is used to measure the resistance of an electrolyte solution.
6. According to Ohm's law, the resistance of an electrolyte solution is the ratio of
A.
Current to potential difference
B.
Potential difference to current
C.
Charge to time
D.
Potential difference to charge
Correct Answer:
Potential difference to current
Explanation:
Ohm's law gives R = V/I, so resistance is the ratio of potential difference to current.
7. A solution has a resistance of 5 ohms. What is its resistance when the applied potential difference is doubled, assuming the current also doubles?
A.
2.5 ohms
B.
5 ohms
C.
10 ohms
D.
25 ohms
Correct Answer:
5 ohms
Explanation:
Resistance is R = V/I. If both potential difference and current are doubled, their ratio remains unchanged, so the resistance remains 5 ohms.
8. Which factor directly affects the resistance of an electrolyte solution in a conductivity cell?
A.
Length of the solution column
B.
Colour of the solution
C.
Shape of the container label
D.
Mass of the electrodes only
Correct Answer:
Length of the solution column
Explanation:
The resistance depends on the length of the electrolyte column, as shown by R = ρl/A.
9. The resistance of an electrolyte solution increases when the distance between the electrodes is
A.
Decreased
B.
Increased
C.
Made zero without changing the solution
D.
Kept unrelated to the solution column
Correct Answer:
Increased
Explanation:
Increasing the distance between the electrodes increases the length of the conducting electrolyte path, thereby increasing resistance.
10. For an electrolyte solution, resistance is measured between two electrodes by applying a
A.
Potential difference
B.
Mass difference
C.
Temperature difference only
D.
Volume difference
Correct Answer:
Potential difference
Explanation:
Resistance is determined from the potential difference applied across the electrolyte and the resulting current using R = V/I.
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