Chemistry Chapter 9 Entry Test MCQs
51. An electrolyte
a. Gives ions only when electricity is passed
b. Forms complex ions in solution
c. Gives ions only when dissolved in water
d. Possesses ions even in solid state
52. Electrolyte can conduct electricity because
a. The molecules break up into ions when a voltage is applied
b. Their molecules contain unpaired electrons, which are mobile
c. The molecules are broken up into ions when the electrolyte is fused or is dissolved in the solvent
d. Their molecules contain loosely held electrons which get free under the influence of voltage
53. Which one of the following metals could not be obtained on electrolysis of aqueous solution of its salts?
a. Cu
b. Ag
c. Cr
d. Mg
54. On the electrolysis of aqueous solution of sodium sulphate, on cathode we get:
a. SO2
b. Na
c. SO3
d. H2
55. Which of the following compounds will not undergo decomposition on passing electricity through aqueous solution?
a. Sodium Bromide
b. Sugar
c. Sodium Acetate
d. Sodium Chloride
56. During the electrolysis of an electrolyte, the number of ions produced, is directly proportional to the:
a. Electro chemical equivalent of electrolysis
b. Time consumed
c. Mass of electrons
d. Quantity of electricity passed
57. When the sample of copper with zinc impurity is to be purified by electrolysis, the appropriate electrodes are:
a. Pure zinc (cathode) and pure copper (anode)
b. impure sample (cathode) and pure copper (anode)
c. impure zinc (cathode) and impure sample (anode)
d. pure copper (cathode) and impure sample (anode)
58. In the electrolytic cell, flow of electrons is from:
a. Cathode to anode through external supply
b. Cathode to anode in solution
c. Anode to cathode through internal supply
d. Cathode to anode through internal supply
59. A solution of sodium sulphate in water is electrolyzed using inert electrodes. The products at the cathode and anode are respectively:
a. O2 , Na
b. H2 , O2
c. O2 , SO2
d. O2 , H2
60. During the electrolysis of fused NaCl, which reaction occurs at anode:
a. Chloride ions are reduced
b. Chloride ions are oxidized
c. Sodium ions are reduced
d. Sodium ions are oxidized
61. During electrolysis of NaCl solution, part of the reaction is Na+ + e– Na. This is termed as:
a. Deposition
b. Oxidation
c. Cathode reaction
d. Reduction
62. The passage of current liberates H2 at cathode and Cl2 at anode. The solution is
a. NaCl in water
b. Copper chloride in water
c. Water
d. H2SO4
63. Electrolysis is a process in which the cations and anions of the electrolyte are:
a. Hydrolyzed
b. Hydrated
c. Discharged
d. Charged
64. In which of the following cells, zinc is used as anode?
a. Silver oxide cell
b. Dry alkaline
c. Galvanic cell
d. All of above
65. A device that converts the energy of combustion of fuels like hydrogen and methane directly into electrical energy is known as
a. Ni-Cd cell
b. Electrolytic cell
c. Fuel cell
d. Dynamo
66. The chemical NaOH which is used in the manufacture of soaps, detergents, papers etc. is prepared by the electric current in…
a. H2O
b. aqueous NaCI
c. Aqueous KCI
d. Molten NaCI
67. The process of electrolysis is used in…
a. electro plating
b. decomposition of H20 in H2 and O2
c. electro-refining
d. all of these
68. In case of electronic conductors, the conduction of electricity is due to….
a. Flow of matter
b. flow of electrons
c. do not conduct electricity
d. Flow of ions
69. Pick out the incorrect sta
a. an oxidation half reaction occurs at anode
b. ionic conduction involves the motion of ions
c. electrodes may or may not take part in reactions
d. reduction half reaction occurs at anode
70. The electrolytic products of which of the following are same as for the electrolysis of water.
a. Aqueous NaCl
b. Aqueous CuSO4
c. Aqueous KCl
d. Aqueous ZnSO4
71. The product of electrolysis will not be same as for the electrolysis of water.
a. NaOH(aq)
b. NaNO3(aq)
c. CuSO4 (aq)
d. H2SO4(aq)
72. _______is not there in all the galvanic cells (I) Salt bridge (II) electrolyte (III) electrode
a. I and II only
b. only
c. I, II and III
d. II and III only
73. In the electrolysis of dil. H2SO4 using platinum electrode, what is true
a. H2 is evolved at anode
b. OH– is discharged at the cathode
c. SO2 is evolved at anode
d. Oxygen is evolved at anode
74. The process used to deposit one metal over another metal is called
a. carbon plating
b. Electrolysis
c. Purification
d. Electroplating
75. In an electrochemical cell the emf will not be zero, because The reaction is: Pt, H2 (1 atm)| HC1 (0.1 M) || CH3COOH (0.1 M) | H2 (1 atm), Pt.
a. pH of 0.1 M HCI and 0.1 M CH3COOH is not same
b. emf depends upon molarities of acids used
c. Acids used in two compartments are different
d. Temperature is constant