Tag: refining of metals

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

Anode mud is obtained in which of the following processes?

  1. Roasting

  2. Zone refining

  3. Electrolytic refining

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

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

Which of the following metal refined-electrolytically?

  1. $Al$
  2. $Na$
  3. $Cu$
  4. $Fe$
Reveal answer Fill a bubble to check yourself
A,C Correct answer
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.

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

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

  1. $Na$
  2. $Au$
  3. $Cu$
  4. $Al$
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

The metal refined-electolytically is:

  1. $Al$
  2. $Na$
  3. $Cu$
  4. $Fe$
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 

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

Which of the following is purification method?

  1. Distillation

  2. Electrolytic process

  3. Filtration

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
Multiple choice chemistry production of metals refining of metals basics of metallurgy basic metallurgical processes

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.

  1. a, b

  2. b, c

  3. a, c

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.