chemistry : class12 Specific Conductance : Conductance in electrolytic solutions : Electrochemistry MCQ Questions and Answers
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Specific Conductance
MCQ questions and answers.
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MCQ Questions
1. What is the specific conductance of an electrolytic solution?
A.
Conductance of a solution of any volume
B.
Conductance of a solution kept between electrodes 1 cm apart with area 1 cm²
C.
Resistance offered by a solution of length 1 cm
D.
Conductance of one mole of an electrolyte
Correct Answer:
Conductance of a solution kept between electrodes 1 cm apart with area 1 cm²
Explanation:
Specific conductance is the conductance of a solution contained between electrodes of unit length and unit cross-sectional area.
2. What is the commonly used unit of specific conductance in chemistry?
A.
ohm cm
B.
ohm⁻¹ cm⁻¹
C.
ohm cm² mol⁻¹
D.
S cm² mol⁻¹
Correct Answer:
ohm⁻¹ cm⁻¹
Explanation:
Specific conductance is commonly expressed in ohm⁻¹ cm⁻¹, which is also written as S cm⁻¹.
3. Which symbol is commonly used to represent specific conductance?
A.
κ
B.
R
C.
G
D.
l
Correct Answer:
κ
Explanation:
Specific conductance is conventionally represented by the Greek letter kappa, κ.
4. What is the relationship between specific conductance κ, conductance G, length l, and area of cross-section A?
A.
κ = G A / l
B.
κ = G l / A
C.
κ = A / G l
D.
κ = l / G A
Correct Answer:
κ = G l / A
Explanation:
Specific conductance is calculated using κ = G l / A, where l/A is the cell constant.
5. Specific conductance is the reciprocal of which quantity?
A.
Resistance
B.
Resistivity
C.
Cell constant
D.
Electrode area
Correct Answer:
Resistivity
Explanation:
Specific conductance is the reciprocal of resistivity: κ = 1/ρ.
6. If the resistance of an electrolytic solution is R, its conductance is:
A.
R
B.
R²
C.
1/R
D.
1 + R
Correct Answer:
1/R
Explanation:
Conductance G is the reciprocal of resistance, so G = 1/R. Specific conductance can then be found using κ = G l/A.
7. The dimensions of a solution column are 1 cm in length and 1 cm² in cross-sectional area. Its measured conductance is 0.02 S. What is its specific conductance?
A.
0.005 S cm⁻¹
B.
0.02 S cm⁻¹
C.
0.5 S cm⁻¹
D.
2 S cm⁻¹
Correct Answer:
0.02 S cm⁻¹
Explanation:
Using κ = G l/A, κ = 0.02 × 1/1 = 0.02 S cm⁻¹.
8. What happens to the specific conductance of an electrolyte solution when it is diluted?
A.
It generally increases
B.
It generally decreases
C.
It always becomes zero
D.
It remains exactly unchanged
Correct Answer:
It generally decreases
Explanation:
On dilution, the number of ions per unit volume decreases, so the specific conductance generally decreases.
9. Which factor directly affects the specific conductance of an electrolytic solution?
A.
Number of ions per unit volume
B.
Colour of the solution
C.
Shape of the beaker only
D.
Mass of the electrodes only
Correct Answer:
Number of ions per unit volume
Explanation:
Specific conductance depends on the concentration and mobility of ions present per unit volume of the solution.
10. A solution has a conductance of 0.04 S, an electrode separation of 2 cm, and an electrode area of 1 cm². What is its specific conductance?
A.
0.02 S cm⁻¹
B.
0.04 S cm⁻¹
C.
0.08 S cm⁻¹
D.
0.16 S cm⁻¹
Correct Answer:
0.08 S cm⁻¹
Explanation:
Using κ = G l/A, κ = 0.04 × 2/1 = 0.08 S cm⁻¹.
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