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Electrolysis: Electrolytes and Non-electrolytes (Cla...

Electrolysis: Electrolytes and Non-electrolytes

13 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following statements is not correct about the characteristics of electrolysis?

  1. The passage of electricity through an electrolyte causes cations to migrate towards anode and anions to migrate towards cathode.
  2. The number of electrons given by anode is equal to the number of electrons gained by cathode.
  3. The products of electrolysis are formed at anode and cathode.
  4. Only hydrogen gas and metals are liberated at cathode.
  5. Only non-metals are liberated at anode.
Question 2 Multiple Choice (Single Answer)

Which of the following statements is not correct about the theory of electrolytic dissociation?

  1. Cations and anions are formed as a result of dissociation of electrolyte in water.
  2. All ions carry an electric charge and are responsible for the flow of current.
  3. The conductivity of electrolyte is independent of the concentration of ions in the solution.
  4. The degree of dissolution is the extent to which an electrolyte dissociates.
Question 3 Multiple Choice (Single Answer)

Which of the following substances will completely dissociate in fused or aqueous state?

  1. H2CO3
  2. H3PO4
  3. Ca(OH)2
  4. H2SO4
Question 4 Multiple Choice (Single Answer)

Which of the following covalent compounds will not conduct electricity when dissolved in aqueous solution?

  1. H2O
  2. NH3
  3. HCl
  4. CO2
Question 5 Multiple Choice (Single Answer)

Which of the following non-metals, being a good conductor of electricity, is used for making electrodes?

  1. Iodine
  2. Graphite
  3. Fluorine
  4. Phosphorus
  5. Krypton
Question 6 Multiple Choice (Single Answer)

Which of the following statements is incorrect about electrolytes such as HCl, H2SO4 and HNO3?

  1. These allow a large amount of electricity to flow through them.
  2. These are poor conductors of electricity.
  3. These are almost completely dissociated in fused or aqueous state.
  4. Their solutions contain almost only free mobile ions.
  5. None of these
Question 7 Multiple Choice (Single Answer)

Which of the following options represents an acid, a base and a salt which act as electrolytes?

  1. H2SO4, HNO3, KOH
  2. HCOOH, Ca(OH)2, Na2CO3
  3. NaHCO3, CuCl2, NaOH
  4. H2SO4, HCOOH, NaHCO3
  5. HNO3, Ca(OH)2, CuCl2
Question 8 Multiple Choice (Single Answer)

Which of the following statements is not correct about electrolysis of aqueous copper sulphate using copper electrode?

  1. Iron crucible or glass voltmeter is used as electrolyte cell.
  2. Aqueous copper sulphate solution is used as electrolyte.
  3. Electrodes made of carbon are used as cathode and anode.
  4. Ordinary temperature is used in the process.
Question 9 Multiple Choice (Single Answer)

Which of the following metals is extracted by electrolysis of its fused salt?

  1. Platinum
  2. Silver
  3. Potassium
  4. Lead
Question 10 Multiple Choice (Single Answer)

Which of the following statements is not correct about electrolytic refining of copper?

  1. Impure copper is made anode.
  2. Thin strip of pure copper is made cathode.
  3. Solution of copper sulphate and dilute sulphuric acid is used as electrolyte.
  4. Copper ions migrate to the anode.
  5. Copper deposited on cathode is 94.91% pure.
Question 11 Multiple Choice (Single Answer)

Which of the following is not a necessary condition for electroplating?

  1. The article to be electroplated is always placed at cathode.
  2. The metal to be plated is made anode.
  3. The electrolyte must contain ions of the metal which is to be plated.
  4. A higher current for a short time should be used.
  5. A direct current and not A.C. current should be used.
Question 12 Multiple Choice (Single Answer)

Which of the following ions act as spectator ions during electrolysis of aqueous copper sulphate solution?

  1. Cu2+, SO42-
  2. H+, SO42–
  3. Cu2+, H+
  4. H+, OH–, SO42–
Question 13 Multiple Choice (Single Answer)

Which of the following statements is not correct about electrolysis of concentrated NaCl solution?

  1. Both Na+ and H3O+ migrate to cathode.
  2. Concentration of H3O+ is higher than that of Na+.
  3. Both Cl- and OH- migrate to anode.
  4. Concentration of Cl- is higher than that of OH-.
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