MCQs on Electrochemistry with Answers

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Electro-Chemistry Notes Link: 12 Class Chemistry- Electrochemistry (chemistrynotesinfo.com)

MCQ-1.  If one end of a piece of metal is heated, the other end becomes hot after some time. This is due to:

  resistance of the metal

  minor perturbation in the energy of atoms

  energised electrons moving to the other part of the metal

  mobility of atoms of the metal

MCQ-2.  Which is not correct? The degree of dissociation of an electrolyte depends on:

  Nature of the electrolyte

  Catalytic action

  Dilution

  Temprature

MCQ-3.  The equivalent conductivity of 0.1 M weak acid is 100 time less than that at infinite dilution. The degree of dissociation is:

  100

  10

  0.01

  0.001

MCQ-4.  Which of the following aqueous solution will conduct an electric current quite well?:

  Glycerol

  HCI

  sugar

  Pure water

MCQ-5.  The one that is a good conductor of electricity in the following list of solids is:

  Sodium chloride

  Graphite

  Diamond

  Sodium bromide

MCQ-6.  Electrolysis of molten NaCI leads to the formation of:

  sodium and hydrogen

  sodium and oxygen

  hydrogen and oxygen

  sodium and chlorine

MCQ-7.  Which of the following represents the first law of faraday?

  E = mc²

  m = zct

  E = hv

  Pv = nRT

MCQ-8.  When one ampere current flows for 1 second through a conductor, this quantity of electricity is called:

  Faraday

  Coulomb

  EMF

  Ohm

MCQ-9.  The number of faradays needed to reduce 4 gm equivalents of Cu²⁺ to Cu metal will be:

  1

  2

  0.5

  4

MCQ-10.  If the electrodes in the cell are 2.2 cm apart and have an area of 3.8 sq. cm, then the cell constant is:

  2

  1.25

  7.5

  0.6

MCQ-11.  The quantity of electricity needed to liberate 0.5 gram equivalent of an element is:

  48250 faraday

  4825 0coulomb

  19300 faraday

  19300 coulomb

MCQ-12.  Pure water is poor conductor of electricity because it:

  has low boiling point

  is almost unionised

  is neutral

  is readily decomposed

MCQ-13.  How many c.c. of oxygen will be liberated by 2 ampere flowing for 3 minutes and 13 seconds through acidulated water?

  11.2 c.c.

  33.6 c.c.

  44.8 c.c.

  22.4 c.c.

MCQ-14.  If a salt bridge is removed between the two half cells, the voltage:

  Drops to zero

  Does not change

  Increases gradually

  Increases rapidly

MCQ-15.  Which of the following metals can deposit copper from copper sulphate solution?

  Mercury

  Iron

  gold

  Platinum

MCQ-16.  The most powerful reducing agent is:

  Mg

  K

  Na

  Ba

MCQ-17.  2H⁺ (aq) + 2e^- -> H₂ (g) Standard electrode potential for the above reaction is (in volts):

  0

  +1'

  -1

  None of these

MCQ-18.  Electroplating is discovered by:

  Faraday

  Aufbau

  Dalton

  Arrhenius

MCQ-19.  The number of coulombs required for the deposition of 107.870 g of silver is:

  96500

  48250

  193000

  10000

MCQ-20.  Which of the following cells can convert chemical energy of H₂ and O₂ directly into electrical energy?

  Mercury cell

  Daniel cell

  Fuel cell

  Lead storage cell