Electrochemistry Quiz: MCQ Exam! Trivia

15 Questions | By Jagranjosh | Updated: Mar 21, 2022 | Attempts: 3579

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Electrochemistry Quiz: MCQ Exam! Trivia - Quiz

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1.

Li occupies higher position in the electrochemical series of metals as compared to Cu since:
- 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
2.

Which of the following decreases with dilution:
- A.
  
  Molar Conductance
- B.
  
  Conductance
- C.
  
  Specific Conductance
- D.
  
  Equivalent Conductance
3.

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
4.

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
5.

The standard electrode potential is measured by:
- A.
  
  Electrometer
- B.
  
  Voltmeter
- C.
  
  Pyrometer
- D.
  
  Galvanometer
6.

Saturated solution of KNO₃ is used to make 'salt bridge' because:
- 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
7.

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
8.

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
9.

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
10.

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
11.

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
12.

Which of the following reaction is preferred during electrolysis of dilute sulphuric acid:
- A.
  
  2H₂O (l) → O₂(g) + 4H⁺ (aq) + 4e^-
- B.
  
  2SO₄^2- (g) → S₂O₈^2- (g) + 2e^-
- C.
  
  2H₂ (g) + 4OH^- (aq) → 4H₂O (l) + 4e^-
- D.
  
  2SO₄^2- (aq) → S₂O₈^2- (aq) + 2e^-
13.

When KMnO₄ acts as an oxidizing agent and ultimately forms MnO₄^2–, MnO_2,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
14.

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 10³g
- B.
  
  8.1 x 10⁴g
- C.
  
  2.4 x 10⁵g
- D.
  
  9.0 x 10³g
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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