This set of Physical Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Electrical Conductivity of Weak Electrolytes”.
1. Name the process in which substance gains electron:
a) Hydrogenation
b) Sublimation
c) Reduction
d) Oxidation
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Explanation: In reduction, substance loses oxygen or gain electrons. The full reaction is known as the redox reaction. Oxidation is the opposite of reduction.
2. Sodium metal is prepared by electrolysis of fused:
a) NH3
b) NaO
c) NaOH
d) NaCl
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Explanation: Sodium chloride is crystallized out of the solution of sodium chloride and water and melted. The molten sodium chloride is electrolyzed to extract sodium metal.
3. Corrosion can be prevented by Alloying.
a) False
b) True
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Explanation: Corrosion can be prevented by alloying by adding two elements: chromium and nickel. It improves the thermal and mechanical properties of the steel.
4. Which electrolyte is used for tin plating?
a) Sodium chloride
b) Sulphide ore
c) Stannous sulphate
d) Hydrogen sulphate
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Explanation: Stannous sulfate is used for electroplating plating and dying agent. Tin plating is a process to create a mirror-like finish on different metals.
5. In an electrochemical cell chemical energy changes to:
a) Electrical energy
b) Physical energy
c) Potential energy
d) Kinetic energy
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Explanation: Electrochemical cell is a device which is used to convert chemical energy to electrical energy. They are of two types: Galvanic cell and Electrolytic cell.
6. The potential of the cell depends upon the temperature.
a) True
b) False
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Explanation: Cell potential is used to measure the voltage between two half cells of the battery. It depends upon temperature, pressure, and concentration.
7. What is ionization?
a) Potential difference between two electrodes
b) Neutral atom converted to charged atoms
c) Internal energy per unit mass
d) Power required for the utilization of physical sources
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Explanation: Ionization is the process of acquiring a positive or negative charge by an atom. Some examples are the fluorescent lamp or electrical discharge lamps.
8. What is the emf if the reaction is spontaneous?
a) Zero
b) Positive
c) Negative
d) Positive or negative
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Explanation: EMF is the maximum potential difference between the two electrodes in a cell. For a spontaneous reaction, the emf is positive.
9. What is the flow of electrons in an electrolytic cell?
a) Anode to cathode
b) Cathode to anode
c) Random flow
d) Cathode to anode or opposite
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Explanation: An electrolytic cell is used to decompose chemical compounds. This process is called electrolysis. An electrolyte is a solution of solvents or water in which electrons flow from anode to cathode.
10. What is the reduction or oxidation potential of standard hydrogen electrode is?
a) 0.8 V
b) 1.1 V
c) 1.8 V
d) 0.0 V
View Answer
Explanation: Standard hydrogen electrode (SHE) forms the basis of oxidation and reduction potential. It is a redox electrode. Its reduction or oxidation potential is 0.0 V.
Sanfoundry Global Education & Learning Series – Physical Chemistry.
To practice all areas of Physical Chemistry, here is complete set of Multiple Choice Questions and Answers.
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