1. What is the SI unit of conductivity?
A.
S m⁻¹
B.
S m² mol⁻¹
C.
Ω m
D.
mol L⁻¹
Correct Answer:
S m⁻¹
Explanation:
The SI unit of conductivity is siemens per metre (S m⁻¹).
2. Which unit is commonly used for conductivity in chemistry laboratories?
A.
S cm⁻¹
B.
S cm² mol⁻¹
C.
mol cm⁻³
D.
Ω cm
Correct Answer:
S cm⁻¹
Explanation:
Conductivity is commonly expressed in siemens per centimetre (S cm⁻¹).
3. The unit Ω⁻¹ cm⁻¹ is equivalent to which unit?
A.
S cm⁻¹
B.
S m⁻¹
C.
Ω cm
D.
S cm² mol⁻¹
Correct Answer:
S cm⁻¹
Explanation:
Since siemens (S) is equivalent to Ω⁻¹, Ω⁻¹ cm⁻¹ is the same as S cm⁻¹.
4. Which of the following represents conductivity in SI units?
A.
Siemens per metre
B.
Siemens per mole
C.
Ohm metre
D.
Coulomb per metre
Correct Answer:
Siemens per metre
Explanation:
Conductivity in the SI system is measured in siemens per metre, written as S m⁻¹.
5. What is the relationship between S m⁻¹ and S cm⁻¹?
A.
1 S m⁻¹ = 0.01 S cm⁻¹
B.
1 S m⁻¹ = 100 S cm⁻¹
C.
1 S m⁻¹ = 10 S cm⁻¹
D.
1 S m⁻¹ = 1000 S cm⁻¹
Correct Answer:
1 S m⁻¹ = 0.01 S cm⁻¹
Explanation:
Because 1 m = 100 cm, conductivity values convert as 1 S m⁻¹ = 0.01 S cm⁻¹.
6. A conductivity value of 0.5 S cm⁻¹ is equal to:
A.
50 S m⁻¹
B.
0.005 S m⁻¹
C.
5 S m⁻¹
D.
500 S m⁻¹
Correct Answer:
50 S m⁻¹
Explanation:
To convert S cm⁻¹ to S m⁻¹, multiply by 100. Thus, 0.5 S cm⁻¹ equals 50 S m⁻¹.
7. A conductivity of 200 S m⁻¹ is equal to:
A.
2 S cm⁻¹
B.
20 S cm⁻¹
C.
0.2 S cm⁻¹
D.
20000 S cm⁻¹
Correct Answer:
2 S cm⁻¹
Explanation:
To convert S m⁻¹ to S cm⁻¹, divide by 100. Therefore, 200 S m⁻¹ equals 2 S cm⁻¹.
8. Which unit is not a unit of conductivity?
A.
S m⁻¹
B.
S cm⁻¹
C.
Ω⁻¹ cm⁻¹
D.
S cm² mol⁻¹
Correct Answer:
S cm² mol⁻¹
Explanation:
S cm² mol⁻¹ is the unit of molar conductivity, not conductivity.
9. The unit of conductivity can also be written as:
A.
Ω⁻¹ m⁻¹
B.
Ω m⁻¹
C.
Ω⁻¹ m
D.
Ω m
Correct Answer:
Ω⁻¹ m⁻¹
Explanation:
Since S is equal to Ω⁻¹, the SI unit S m⁻¹ can also be written as Ω⁻¹ m⁻¹.
10. Which expression correctly identifies the unit of specific conductance, also called conductivity?
A.
S cm⁻¹
B.
S cm² mol⁻¹
C.
mol S⁻¹ cm⁻²
D.
Ω cm
Correct Answer:
S cm⁻¹
Explanation:
Specific conductance or conductivity is measured in S cm⁻¹, which is also written as Ω⁻¹ cm⁻¹.
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