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Chemical Effects of Electric Current Test - 13

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Chemical Effects of Electric Current Test - 13
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  • Question 1
    1 / -0
    In electroplating of the silver spoon with gold, the silver spoon is cleaned with a dilute acid solution to remove the  _________  from its surface.
    Solution
    The silver spoon is cleaned with a dilute acid solution to remove the oxide layer from its surface and washed in running water until it is free from the acid.
  • Question 2
    1 / -0
    In electroplating of a silver spoon with gold, the gold plate is connected to:
    Solution
    The material which should be deposited on the object is always connected to the positive terminal of the battery. In electroplating of a silver spoon with gold, the gold plate is connected to the positive terminal of the battery, and the silver spoon is connected to the negative terminal of the battery.
  • Question 3
    1 / -0
    The process in which a layer of one metal is coated with another metal by electrolysis is called:
    Solution
    The process in which a layer of one metal is coated with another metal by electrolysis is called electroplating.
    Electrorefining is a process in which materials, usually metals, are purified by means of an electrolytic cell.
    Electrostatics is a branch of physics that studies electric charges at rest.
  • Question 4
    1 / -0
    The process of depositing a layer of gold on silver is known as:
  • Question 5
    1 / -0
    Which one of the following scientists showed that if electrodes are immersed in water and a current was passed, bubbles of oxygen and hydrogen were produced?
    Solution
    William Nicholson showed that if electrodes are immersed in water and a current was passed, bubbles of oxygen and hydrogen were produced. And, this process is called the electrolysis of water.
  • Question 6
    1 / -0
    In charging a battery of motor-car, which of the following effect of electric current is used?
    Solution

    The entity that is to be charged must be at a lower potential in comparison to the source because the flow of electrons will always be from higher potential to lower potential. The energy that flows between the source and the body to be charged is stored in the form of chemical energy.

           Hence in charging of a battery of a motor car the chemical effect of electric current is used. [Option C]

  • Question 7
    1 / -0
    Which of the following metals is used in electroplating to make objects appear shining?
    Solution
    Chromium is a lustrous, brittle, hard metal. Its colour is silver-grey and it can be highly polished.
  • Question 8
    1 / -0
    Electroplating does not help in:
    Solution
    Electroplating is a process that adds a surface layer of metal to another metal. It is primarily used to change the surface properties of an object like appearance, corrosion protection, lubricity, etc. Thus, electroplating does not help in making the metals become hard. 

    Hence, option C is correct.

  • Question 9
    1 / -0
    Electroplating can be done by :
    Solution
    Electroplating is the process in which one metal is coated over other by electrolysis to prevent corrosion of metal or to enhance appearance.  

  • Question 10
    1 / -0
    A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly for liquid A while it glows very dimly for liquid B. You would conclude that
    (i) liquid A is a better conductor than liquid B.
    (ii) liquid B is a better conductor than liquid A.
    (iii) both liquids are equally conducting.
    (iv) conducting properties of liquid cannot be compared in this manner
    Solution
    Option (i) is correct i.e., liquid A is a better conductor than liquid B. The amount of current flowing through a conducting solution depends on the conductivity of the solution. With more conductivity, more current passes through the solution and vice-versa. Hence, the conductivity of liquid A is more than the conductivity of liquid B.
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