This set of Applied Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Electro Chemical Cells”.
1. In electrolytic conductors, the conductance is due to _____________
a) Flow of free mobile electrons
b) Movement of ions
c) Either movement of electrons or ions
d) Cannot be said
Explanation: In metallic conductors, the conductance is due to the flow of free mobile electrons and in electrolytic conductors, the conductance is due to the movement of ions in a solution of fused electrolyte.
2. Which of the following is the example of the electrolytes?
Explanation: The acids and bases are the examples of the electrolytes and some solid salts, metals, alloys and oxides are the examples of the metallic conductors.
3. The resistance of the conductor in the electrolytic cell ___________ with an increase in temperature.
c) Slightly increase
d) Do no change
Explanation: The resistance of the conduction in the electrolytic cell decreases with increase in the temperature. In metallic conductors, resistance of the conductor increases with increase in temperature.
4. The process of decomposition of an electrolyte by passing electric current through its solution is called as __________
d) Electrochemical cell
Explanation: The process of decomposition of an electrolyte by passing electric current through its solution is called as electrolysis.
5. Specific conductance is expressed in terms of __________
c) Ohm-1 cm-1
d) Ohm-1 cm
Explanation: Specific conductance is expressed in terms of ohm-1 cm-1 As we know that k=l/S * 1/S = cm/[(cm)2 * ohm] =Ohm-1 cm-1.
6. The specific conductance of the electrolyte ___________ on dilution.
c) Slightly increases
d) Cannot be determined
Explanation: The specific conductance of the electrolyte decreases on dilution. Equivalent conductance increases on dilution.
7. Which of the following are the strong electrolytes?
b) Acetic acid
c) Propinoic acid
Explanation: The strong electrolyte is HCL because it is strong acid and acts as electrolyte. The acetic acid, propinoic acid and H2SO3 are weak acid electrolytes.
8. Which of the following is the weak base electrolyte?
d) Alkyl amines
Explanation: NaOH, KOH and Ca(OH)2 are strong base electrolytes and the alkyl amines are the weak base electrolytes.
9. Mercuric chloride is a strong electrolyte.
Explanation: Almost all salts are strong electrolytes practically. The mercuric chloride and lead acetate are the weak electrolytes.
10. The degree of ionisation is given by____________
a) α = λv * λα
b) α = λv / λα
c) α = λv – λα
d) α = λv + λα
Explanation: The degree of ionisation is given by α = λv / λα where α = degree of ionisation, λα = equivalent conductance at infinite dilution.
11. In electrolyte, ionisation ___________ on dilution.
c) Becomes very small
d) Do not change
Explanation: In electrolyte, ionisation increases on dilution, till the whole of the electrolyte substance has ionised.
12. To detect the flow of current a head telephone ear piece is used instead of __________
Explanation: Instead of galvanometer, to detect the flow of current a head telephone earpiece is used to determine the equivalent conductance.
13. The electrolyte is placed in a special type of cell known as ____________
a) Conductivity cell
b) Conductance cell
c) Equivalent cell
d) Conduction cell
Explanation: The electrolyte is placed in a special type of cell known as conductance cell. The conductance is made of highly resistant glass such as pyrex or quartz.
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