Tag: basic metallurgical processes

Quizzes (0) Questions (71)

Questions Related to basic metallurgical processes

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

Refining of metal is:

  1. purification of metal

  2. concentration of metal

  3. conversion into oxides

  4. none of above
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. copper chloride

  2. copper sulphide

  3. copper sulphate

  4. impure copper
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 

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

For alkali metals, only electrolytic reduction is employed.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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.


  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)
Reveal answer Fill a bubble to check yourself
A Correct answer
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.


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

Which of the following represents correct statement(s)?

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
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.