Electrochemistry MCQ

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• The Nernst equation for the reaction, A²⁺ + 2e^- → B, in terms of the free energy change is
  ক

  ΔG = ΔG° + 2.303 RT log $$\frac{{\left}}{{\left}}$$

  খ

  ΔG = ΔG° - 2.303 RT log $$\frac{{\left}}{{\left}}$$

  গ

  -ΔG = -ΔG° + 2.303 RT log $$\frac{{\left}}{{\left}}$$

  ঘ

  ΔG = -ΔG° + 2.303 RT log $$\frac{{\left}}{{\left}}$$
• For the reaction, Hg₂Cl₂(s) + H₂(g) → 2Hg(liq) + 2HCl(aq), the correct representation of the cell and the thermodynamic properties ΔG, ΔH and ΔS at 298 K respectively, are (Given: E₂₉₈ = 0.2684 V and temperature coefficient = 3 × 10^-4 VK^-1)
  ক

  Pt|H₂(g, 1 atm)|HCl(aq)|Hg₂Cl₂(g)|Hg(liq) ΔG = -51.8 kJ mol^-1, ΔH = -69 kJ mol^-1, ΔS = -58 JK^-1 mol^-1

  খ

  Pt|H₂(g, 1 atm)|HCl(aq)|Hg₂Cl₂(g)|Hg(liq) ΔG = -25.9 kJ mol^-1, ΔH = -34.5 kJ mol^-1, ΔS = -29 JK^-1 mol^-1

  গ

  Hg(liq)|H₂Cl₂(g)|HCl(aq)|H₂(g, 1 atm)|Pt ΔG = -51.8 kJ mol^-1, ΔH = -69 kJ mol^-1, ΔS = -58 JK^-1 mol^-1

  ঘ

  Hg(liq)|H₂Cl₂(g)|HCl(aq)|H₂(g, 1 atm)|Pt ΔG = 51.8 kJ mol^-1, ΔH = 69 kJ mol^-1, ΔS = 58 JK^-1 mol^-1
• The standard reduction potentials at 298 K for single electrodes are given below.<br>
  ক

  <table class="table-style-1"> <tr> <td><strong>Electrode</strong></td> <td><strong>Electrode potential (volt)</strong></td> </tr> <tr> <td>Mg²⁺ /Mg</td> <td>-2.34</td> </tr> <tr> <td>Zn²⁺ /Zn</td> <td>-0.76</td> </tr> <tr> <td>Fe²⁺ /Fe</td> <td>-0.44</td> </tr></table>From this we can infer that Zn can reduce both Mg²⁺ and Fe²⁺

  খ

  Fe can reduce both Mg²⁺ and Zn²⁺

  গ

  Mg can reduce both Zn²⁺ and Fe²⁺

  ঘ

  Mg can reduce Zn²⁺ but not Fe²⁺
• For a 2 molal aqueous NaCl solution, the mean ionic activity coefficient $$\left( {{\gamma _ \pm }} \right)$$  and the Debye-Huckel Limiting Law constant (A) are related as
  ক

  $$\log {\gamma _ \pm } = \sqrt 2 A$$

  খ

  $$\log {\gamma _ \pm } = - \sqrt 2 A$$

  গ

  $${\gamma _ \pm } = {10^4}$$

  ঘ

  $${\gamma _ \pm } = {10^{ - 4}}$$
• A student recorded a polarogram of 2.0 mM Cd²⁺ solution and forget to add KCl solution. What type of error do you expect in his results?
  ক

  Only migration current will be observed

  খ

  Only diffusion current will be observed

  গ

  Both migration current as well as diffusion current will be observed

  ঘ

  Both catalytic current as well as diffusion current will be observed
• According to the Debye-Huckel limiting law, if the concentration of a dilute aqueous solution of KCl is increased 4-fold, the value of In γ_z (γ_z is the molar mean ionic activity coefficient) will
  ক

  decrease by a factor of 2

  খ

  increase by a factor of 2

  গ

  decrease by a factor of 4

  ঘ

  increase by a factor of 4
• Given that E°(Fe³⁺, Fe) = -0.4 V and E°(Fe²⁺, Fe) = -0.44 V, the value of E°(Fe³⁺, Fe²⁺) is
  ক

  0.76V

  খ

  -0.40 V

  গ

  -0.76 V

  ঘ

  0.40 V
• The activity of water at 11 bar and 298 K is
  ক

  1.101

  খ

  1.007

  গ

  0.998

  ঘ

  0.898
• For the concentration cell, M|M⁺ (aq, 0.01 mol/dm³)| |M⁺ (aq), 0.1 mol/dm³|M the EMF (E) of the cell at a temperature (T) equals
  ক

  $$2.303\frac{{RT}}{F}$$

  খ

  $$ - 2.303\frac{{RT}}{F}$$

  গ

  $$E_{{M^ + }|m}^ \circ + 2.303\frac{{RT}}{F}$$

  ঘ

  $$E_{{M^ + }|m}^ \circ - 2.303\frac{{RT}}{F}$$
• Which of the following metal does not corrode?
  ক

  Iron

  খ

  Zinc

  গ

  Copper

  ঘ

  Magnesium
• Which of the following is the overall reaction of rusting?
  ক

  2Fe(s) → 2Fe2+ + 4e–

  খ

  O2 (g)+4H+(aq)+4e–⟶2H2O(l)

  গ

  2Fe(s) + O2(g) + 4H+(aq) → 2Fe2+(aq) + 2H2O(l)

  ঘ

  H2O ⇌ H+ + OH–
• Which of the following is not essential for rusting to take place?
  ক

  Metal (like iron)

  খ

  Oxygen

  গ

  Moisture

  ঘ

  Light
• Which of the following is not a method of prevention of corrosion?
  ক

  Galvanization

  খ

  Anti-rust solutions

  গ

  Cathodic protection

  ঘ

  Heating
• Which of the following does not cause rusting of iron?
  ক

  Moisture

  খ

  Vacuum

  গ

  SO2

  ঘ

  CO2
• Magnesium is used as a sacrificial metal to protect iron from rust.
  ক

  True

  খ

  False
• Which of the following statements regarding corrosion is true?
  ক

  Corrosion does not depend on the reactivity of the metal

  খ

  Presence of impurities does not affect the rate of corrosion

  গ

  Strains in metals affect the rate of corrosion

  ঘ

  Presence of electrolytes does not affect the rate of corrosion
• What is the method of protection of iron by coating it with zinc called?
  ক

  Tinning

  খ

  Cathodic protection

  গ

  Galvanization

  ঘ

  Anti-rust solutions
• Rusting of iron is a type of corrosion.
  ক

  True

  খ

  False
• Which of the following are the common ways to produce H2 gas in a fuel cell?
  ক

  Coal and biomass gasification

  খ

  Electrolysis and absorption

  গ

  Steam reforming and electrolysis

  ঘ

  Electromagnetism and steam reforming
• Which of the following statements regarding fuel cells is false?
  ক

  Because of continuous supply, fuel cells never become dead

  খ

  They do not cause pollution

  গ

  Fuel cells have 100% efficiency practically

  ঘ

  The cost of catalysts needed for the electrode reactions is high
• What is the maximum theoretical energy efficiency of a fuel cell?
  ক

  100%

  খ

  69%

  গ

  50%

  ঘ

  83%
• Who invented the first fuel cell?
  ক

  Francis Bacon

  খ

  Thomas Grubb

  গ

  Leonard Niedrach

  ঘ

  William Grove
• Which of the following is supplied to the cathode of a fuel cell?
  ক

  Hydrogen

  খ

  Nitrogen

  গ

  Oxygen

  ঘ

  Chlorine
• Which of the following is not produced in an H2-O2 fuel cell?
  ক

  Electricity

  খ

  Pollutants

  গ

  Heat

  ঘ

  Water
• Which of the following is not a fuel cell?
  ক

  PEM cell

  খ

  Direct methanol cell

  গ

  Solid oxide cell

  ঘ

  Daniell cell
• Which of the following can be used as fuel in a fuel cell?
  ক

  Nitrogen

  খ

  Argon

  গ

  Hydrogen

  ঘ

  Helium
• Which of the following is used as an electrolyte in an H2-O2 fuel cell?
  ক

  KOH

  খ

  NH4OH

  গ

  Fe(OH)2

  ঘ

  Cu(OH)2
• A fuel cell is a type of electrochemical cell.
  ক

  True

  খ

  False
• Which of the following products are formed when a lead storage battery is discharged?
  ক

  SO2

  খ

  Pb

  গ

  PbO2

  ঘ

  PbSO4
• Which of the following statements is not true with respect to a lead storage cell (or a lead-acid battery)?
  ক

  The electrolyte used is an aqueous solution of sulphuric acid

  খ

  The anode is made up of lead

  গ

  The cathode is made up of lead(IV) oxide

  ঘ

  It is a primary cell