Electrochemistry Quiz: MCQ Exam! Trivia
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- 1.Which of the following decreases with dilution:
- A.
Molar Conductance
- B.
Conductance
- C.
Specific Conductance
- D.
Equivalent Conductance
- 2.An increase in equivalent conductance of a strong electrolyte with dilution is mainly due to:
- A.
Increase in number of ions
- B.
Increase in ionic mobility of ions
- C.
100% ionisation of electrolyte at normal dilution
- D.
Increase in both i.e., number of ions and ionic mobility of ions
- 3.
- A.
The standard reduction potential of Li+/Li is lower than that of Cu+/Cu
- B.
The standard reduction potential of Cu+/Cu is lower than that of Li+/Li
- C.
The standard oxidation potential of Li+/Li is lower than that of Cu+/Cu
- D.
Li is smaller in size as compared to Cu
- 4.The standard electrode potential is measured by:
- A.
Electrometer
- B.
Voltmeter
- C.
Pyrometer
- D.
Galvanometer
- 5.
- A.
KNO3 is highly soluble in water
- B.
Velocity of (NO3)- is greater than that of K+
- C.
Velocity of K+ is greater than that of (NO3)-
- D.
Velocity of both K+ and (NO3)- are nearly the same
- 6.What would happen if the electrodes used in the electrolysis process rective:
- A.
Electrode does not participate in the chemical reaction
- B.
Electrodes only act as source and sink for electrons
- C.
Electrodes participate in the electrode reaction
- D.
Electrodes are burnt up
- 7.9.65 C of electric current is passed through fused anhydrous magnesium chloride. The magnesium metal thus, obtained is completely converted into a Grignard reagent. The number of moles of the Grignard reagent obtained is:
- A.
5 x 10-4
- B.
1 x 10-4
- C.
5 x 10-5
- D.
1 x 10-5
- 8.Resistance of a conductive cell filled with a solution of an electrolyte of concentration 0.1 M is 100 Ω. The conductivity of this solution is 1.29 S m–1. Resistance of the same cell when filled with 0.2 M of the same solution is 520 Ω. The molar conductivity of 0.02 M solution of the electrolyte will be:
- A.
1240 x 10-4 S m2 mol-1
- B.
124 x 10-4 S m2 mol-1
- C.
12.4 x 10-4 S m2 mol-1
- D.
1.24 x 10-4 S m2 mol-1
- 9.The reduction potential of hydrogen half-cell will be negative if:
- A.
P(H2) = 1 atm and [H+] = M
- B.
P(H2) = 1 atm and [H+] = 2 M
- C.
P(H2) = 2 atm and [H+] = 1 M
- D.
P(H2) = 2 atm and [H+] = 2 M
- 10.The hydrogen electrode is dipped in a solution of pH 3 at 25°C. The potential would be (the value of 2.303 RT/F is 0.059 V)
- A.
0.177 V
- B.
- 0.177 V
- C.
0.059 V
- D.
- 0.059 V
- 11.Which of the following reaction is preferred during electrolysis of dilute sulphuric acid:
- A.
2H2O (l) → O2 (g) + 4H+ (aq) + 4e-
- B.
2SO42- (g) → S2O82- (g) + 2e-
- C.
2H2 (g) + 4OH- (aq) → 4H2O (l) + 4e-
- D.
2SO42- (aq) → S2O82- (aq) + 2e-
- 12.
![The standard electrode potential for the half cell reactions are:
The E.M.F. of the cell reaction
- ProProfs]( "The standard electrode potential for the half cell reactions are:
The E.M.F. of the cell reaction")
The standard electrode potential for the half cell reactions are: The E.M.F. of the cell reaction- A.
– 1.20 V
- B.
+ 1.20 V
- C.
+ 0.32 V
- D.
– 0.32 V
- 13.Al2O3 is reduced by electrolysis at low potentials and high currents. If 4.0 × 104 amperes of current is passed through molten Al2O3 for 6 hours, what mass of aluminum is produced? (Assume 100% current efficiency, atomic mass of Al = 27 g/mol)
- A.
9.0 x 103 g
- B.
8.1 x 104 g
- C.
2.4 x 105 g
- D.
9.0 x 103 g
- 14.When KMnO4 acts as an oxidizing agent and ultimately forms MnO42–, MnO2, Mn2O3 and Mn2+, then the number of electrons transferred in each case is:
- A.
1, 3, 4, 5
- B.
3, 7, 1, 5
- C.
4, 3, 1, 5
- D.
1, 5, 7, 3
- 15.For a cell reaction involving two electrons change, the standard E.M.F. of the cell is found to be 0.295 V at 25°C. The equilibrium constant of the reaction at 25°C is:
- A.
2.95 x 10-2
- B.
2.95 x 102
- C.
1 x 1010
- D.
1 x 10-10
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