Tag: basic metallurgical processes

Questions Related to basic metallurgical processes

Sodium metal is refined by ___________.

chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

  1. distillation

  2. electrolysis

  3. both $A$ and $B$

  4. none of the above

Show answer
Correct Option: B
Explanation:

Sodium metal is refined by electrolytic method. 

The impurities obtained after extraction of iron by reduction is called as _______.

chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

  1. mud iron

  2. pig iron

  3. dirt iron

  4. impure iron

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Correct Option: B
Explanation:

Iron obtained after extraction by reduction contains 3−4% carbon and other impurities like phosphorus, manganese etc. This is called as pig iron.

By heating pig iron in furnace it is converted to ____________.

chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

  1. wrought iron

  2. impure iron

  3. carbon iron

  4. none of the above

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Correct Option: A
Explanation:

By heating pig iron in furnace it is converted to wrought iron. It is the pure form of iron which contains carbon. It is soft, grey, tough, malleable and ductile.

Refining of metal is:

chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

  1. purification of metal

  2. concentration of metal

  3. conversion into oxides

  4. none of above

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Correct Option: A
Explanation:

Refining consists of purifying an impure material, in this case, a metal. It is to be distinguished from other processes such as smelting and calcining in that those two involve a chemical change to the raw material, whereas in refining, the final material is usually identical chemically to the original one, only it is purer.

The electrolyte used for copper refining is an acidic solution of:

chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

  1. copper chloride

  2. copper sulphide

  3. copper sulphate

  4. impure copper

Show answer
Correct Option: C
Explanation:

The purest copper is obtained by an electrolytic process, undertaken using a slab of impure copper as the anode and a thin sheet of pure copper as the cathode. The electrolyte is an acidic solution of copper sulphate. 

The purest copper is obtained by:

chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

  1. concentration process

  2. electrolytic refining

  3. pyrolysis

  4. crystallization

Show answer
Correct Option: B
Explanation:

The purest copper is obtained by an electrolytic process, undertaken using a slab of impure copper as the anode and a thin sheet of pure copper as the cathode.

For alkali metals, only electrolytic reduction is employed.

chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Definition of electrolytic reduction: Removal of oxygen (or decrease of its active valency in the case of a positive element) by electrical means.

The highly electropositive metals, such as the alkali and alkaline earth metals are isolated by electrolytic reduction of their fused halides, since no suitable chemical reducing agent is available and aqueous solutions could not be used due to reactive nature of these metals.
For alkali metals, only electrolytic reduction is employed.

Match the following.

Separation process Purpose for which we do the separation What do we do with the separated components
1) Separate stones from rice a) To remove non useful components i) We throw away the impurities
2) Churning milk to obtain butter b) To remove impurities or harmful components ii) we throw away the solid component
3) Separate tea leaves c) to separate two different but useful components. iii) we use both the components.


chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

  1. 1) c) ii)

    2) a) i)

    3) b) iii)

  2. 1) c) ii)

    2) b) i)

    3) a) iii)

  3. 1) c) ii)

    2) a) iii)

    3) b) i)

  4. 1) a) ii)

    2) c) i)

    3) b) iii)

Show answer
Correct Option: A
Explanation:
Separation process Purpose for which we do the separation What do we do with the separated components
1) Separate stones from rice c) to separate two different but useful components. ii) we throw away the solid component
2) Churning milk to obtain butter a) To remove non useful components i) We throw away the impurities
3) Separate tea leaves b) To remove impurities or harmful components iii) we use both the components.


Which of the following represents correct statement(s)?

chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

  1. The method of handpicking can be used for separating slightly larger sized impurities like the pieces of dirt, stone and husk from wheat, rice or pulses.

  2. The quantity of such impurities is usually very large.

  3. In such situations, we find that handpicking is not a convenient method of separating substances.

  4. All of the above

Show answer
Correct Option: A
Explanation:

The statement (A) represents correct statement.
The method of handpicking can be used for separating slightly larger sized impurities like the pieces of dirt, stone and husk from wheat, rice or pulses.
The quantity of such impurities is usually not very large.
In such situations, we find that handpicking is a convenient method of separating substances.

Handpicking is used for separating tiny impurities.

chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Handpicking is used for separating slightly larger sized impurities like the pieces of dirt, stone, and husk from wheat, rice or pulses.