Tag: basic metallurgical processes

Questions Related to basic metallurgical processes

Aluminium is purified by :

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

  1. roasting

  2. sublimation

  3. electrolytic refining

  4. reduction with carbon

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Correct Option: C
Explanation:

Aluminium is purified by electrolytic reduction. Aluminium lies on the top of electrochemical series therefore it is purified by electrolytic refining.

Anode mud is obtained in which of the following processes?

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

  1. Roasting

  2. Zone refining

  3. Electrolytic refining

  4. Calcination

Show answer
Correct Option: C
Explanation:

Metals such as Cu, Ag, Zn, Sn, Pb, Al, Ni, Cr are refined by electrolytic refining method. The impure metal is made the anode of a electrolytic cell, while cathode is thin plate of pure metal. Electrolyte is the solution of a double salt of the metal. On passing the electric current pure metal from the anode dissolves and gets deposited at the cathode. The soluble impurities go into the solution while insoluble or less electropositive impurities settle down below the anode as anode mud or sludge. 

Which of the following metal refined-electrolytically?

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

  1. $Al$

  2. $Na$

  3. $Cu$

  4. $Fe$

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Correct Option: A,C
Explanation:

The impure copper from a smelter is cast into a block to form the positive anode and the cathode is made up of purified copper. These are dipped into an electrolyte of copper sulphate solution. purification of aluminium can be carried out by the Hoopes process. This is an electrolytic process.

Which of the following metals is not refined by electrolytic refining?

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

  1. $Na$

  2. $Au$

  3. $Cu$

  4. $Al$

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Correct Option: A
Explanation:

The sodium and chloride produced in the electrolysis are kept from coming in contact with each other as the sodium is highly reactive and it must be prevented from coming in contact with oxygen as the metal quickly oxidizes under high temperature conditions.

The metal refined-electolytically is:

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

  1. $Al$

  2. $Na$

  3. $Cu$

  4. $Fe$

Show answer
Correct Option: C
Explanation:

Copper and zinc will be refined in electrolytic refining process for the following reasons.

$\rightarrow$ It meets the cost of refining 
$\rightarrow$ In more cases, electrolyte is selected which is the sulphate of the metal that is going to be refined. 

Which of the following is purification method?

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

  1. Distillation

  2. Electrolytic process

  3. Filtration

  4. All of the above

Show answer
Correct Option: D
Explanation:
Purification is the physical separation of a chemical substance of interest from foreign or contaminating substances e.g. Filtration, centrifugation, evaporation, liquation, crystallization, adsorption, smelting, refining, distillation, fractionation, electrolysis, sublimation.

Mark the correct option:
a) Pure metal from the electrolyte is deposited at the anode.
b) The soluble impurities go into the solution.
c) Insoluble impurities known as anode mud.

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

  1. a, b

  2. b, c

  3. a, c

  4. All of the above

Show answer
Correct Option: B
Explanation:

On passing the current through the electrolyte, pure metal from the anode dissolves into the electrolyte. An equivalent amount of pure metal from electrolyte is deposited on the cathode.

In electrolytic refining, which of the following is used as an electrolyte?

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

  1. Impure metal

  2. Pure metal

  3. Metal salt

  4. None of the above

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Correct Option: C
Explanation:

A solution of the metal salt is used as an electrolyte. Impute metal is made the anode and a thin strip of pure metal is made of cathode.

Separation of impurities from the extracted metals is generally done by __________.

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

  1. distillation

  2. sedimentation

  3. electrolysis

  4. none of the above

Show answer
Correct Option: C
Explanation:

Separation of impurities from the extracted metals is generally done by electrolysis of impure metals.

Lead is refined by _________________.

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

  1. electrolysis

  2. distillation

  3. oxidation

  4. none of the above

Show answer
Correct Option: A
Explanation:

Lead is refined by electrolytic method. The other metals which are also refined by this method are aluminium and copper.