Chemistry - Electrochemistry

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Question - 1

The life span of aDaniell cell may be increased by

  • A Large Zn electrode
  • B Large Cu electrode
  • C Lowering the temperature
  • D Lowering the concentrations

Question - 2

In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to

  • A Generate heat
  • B Create potential difference between the two electrodes
  • C Produce high purity water
  • D Remove adsorbed oxygen from electrode surfaces

Question - 3

The sacrificial anode protects iron or ships, underground pipelines etc; from rusting, a process is known as cathodic protection, which one of the following metal cannot be used as sacrificial anode?

  • A Tin
  • B Zinc
  • C Magnesium
  • D Aluminium

Question - 4

The depolarization in a primary cell is used for the purpose of 

  • A Increasing the life of the cell
  • B Increasing the emf of the cell
  • C Removing the hydrogen collected at one of the plates
  • D Removing the dipoles from the electrolytes

Question - 5

A smuggler could not carry gold by depositing iron on the gold surface, because

  • A Gold has lower standard reduction potential than iron
  • B Gold has higher standard reduction potential than iron.
  • C Iron rusts
  • D Gold in denser

Question - 6

Consider the following statements
1. The conductivity of electrolyte increases with a rise in temperature.
2. The voltmeter is used in the process of electrolysis.
3. Electrolysis of water is also called hydrolysis.

  • A 1, 2 and 3
  • B 1 and 2
  • C 2 and 3
  • D 3 only

Question - 7

The electrochemical cell stops working after some time because

  • A Electrode potential of both the electrodes becomes zero
  • B One of electrodes completely vanishes
  • C Electrode potential of both electrodes equalizes
  • D The reaction reverses its direction

Question - 8

When two plates of different metals are placed in an electrolyte, the developed emf between them depends on 

  • A The type of electrolyte 
  • B Distance between the plates
  • C The position of the two metals in the electrochemical series.
  • D All of the above

Question - 9

The conduction of electricity through the electrolyte solution is due to

  • A Movement of  molecule of electrolyte
  • B Movement of ions of electrolyte
  • C Movement of separate atom
  • D Movement of particles of the solvent

Question - 10

Consider the following statements regarding a motor car battery.
1. The voltage is usually 12V.
2. The electrolyte used is hydrochloric acid.
3. Electrodes are lead and copper.
4. Capacity is expressed in ampere-hours.

  • A 1 and 2
  • B 2 and 3
  • C 3 and 4
  • D 1 and 4
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