Tag: applications of electrolysis

Questions Related to applications of electrolysis

Chromiumhas a shiny appearance and lt does not corrode

physics chemical effects of electric current applications of electrolysis electroplating extraction of metals by electrolysis

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient

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Correct Option: A
Explanation:

Answer is A.
Electroplating is a very useful process. It is widely used in industry for coating metal objects with a thin layer of a different metal. The layer of metal deposited has some desired property, which the metal of the object lacks. For example, chromium plating is done on many objects such as car parts, bath taps, kitchen gas burners, bicycle handlebars, wheel rims and many others.
Chromium has a shiny appearance. It does not corrode. It resists scratches. However, chromium is expensive and it may not be economical to make the whole object out of chromium. So the object is made from a cheaper metal and only a coating of chromium over it is deposited.
Hence, electroplating of chromium is done on objects like water taps and cycle bell to give them a shiny appearance and prevent them from corrosion. The statement is true.

In electroplating of silver spoon with gold ,silver spoon will act as :

physics chemical effects of electric current applications of electrolysis electroplating extraction of metals by electrolysis

  1. anode

  2. cathode

  3. positively charged electrode

  4. none of these

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Correct Option: B
Explanation:

The object on which we have to deposit a material, should always be at cathode

In electroplating of a silver spoon with gold,the gold plate is taken as:

physics chemical effects of electric current applications of electrolysis electroplating extraction of metals by electrolysis

  1. negatively charged electrode

  2. cathode

  3. anode

  4. All of the above

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Correct Option: C
Explanation:

The material which should be deposited on the object is always at anode.

In electroplating of the silver spoon with gold, the silver spoon is cleaned with a dilute acid solution to remove the  _________  from its surface.

physics chemical effects of electric current applications of electrolysis electroplating extraction of metals by electrolysis

  1. oxide layer

  2. chloride layer

  3. silver layer

  4. gold layer

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Correct Option: A
Explanation:

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.