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Multiple choice chemistry principles of metallurgy extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

The major step involved in extraction of a metal after its ore is :

  1. concentration

  2. reduction

  3. purification

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 The three steps involved in extraction are:
1) Concentration of the ore to remove impurities.
2) Reduction of the ore to get the metal.
3) Purification of the ore.

Multiple choice chemistry principles of metallurgy extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

Which phenomenon occurs during the following change?
Solid wax left out in the sun.

  1. Sublimation

  2. Melting

  3. Condensation

  4. Evaporation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Melting (Change of solid into liquid) - The change of solid into liquid due to increase in temperature is known as melting. Ice, which is a solid melts, i.e. changes into water. 
Similarly, when solid wax gets heated it converts into liquid and this is melting process.

Multiple choice chemistry principles of metallurgy extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

Which of the following is not a method of extraction of metals?

  1. Enrichment of ore

  2. Refining

  3. Magnetic separation

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Refining and magnetic separation are methods of extraction of metals .Enrichment of ore is also known as concentration of ore. It means purification of ore.

Multiple choice chemistry principles of metallurgy extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

Process of removal of gangue from the ore are based on:

  1. differences between physical and chemical properties of the gangue and the ore

  2. difference between densities of gangue and ore

  3. difference between melting point between of gangue and ore

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Impurities are removed prior to the extraction of metal. The process used for removal of gangue from the ore are based on the differences between physical and chemical properties of the gangue.

Multiple choice chemistry principles of metallurgy extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

What will happen during roasting?

  1. The sulphide ores are converted into oxides

  2. The oxide ores are converted into sulphides

  3. The sulphide ores are converted into carbonates

  4. The oxide ores are converted into carbonates.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

During roasting, the sulphide ores are converted into oxides by heating strongly in excess of air.
$ZnS + 3O _2 \rightarrow 2ZnO + 2SO _2$

Multiple choice chemistry principles of metallurgy extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

Which if the following is a common reducing agent for extracting metals from ore?

  1. $CO$

  2. Carbon

  3. Hydrogen

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

Reduction is the process of removal of oxygen for extraction of metals from their oxide ores. The common reducing agents used for reduction of metal oxides are: Carbon monoxide,  Carbon, Hydrogen.

Multiple choice chemistry principles of metallurgy extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

During electrolysis, electrons are being added directly to the metal ions at the ___________.

  1. anode

  2. cathode
  3. both $A$ and $B$

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During electrolysis, electrons are being added directly to the metal ions at the cathode (the negative electrode). The downside (particularly in the aluminum case) is the cost of the electricity. An advantage is that it can produce very pure metals.

Multiple choice chemistry production of metals extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

Which of the following technique uses high temperature to convert ore into raw metals?

  1. Pyrometallurgy

  2. Hydrometallurgy

  3. Both a and b

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

After the ore is mined, the metals must be extracted, usually by chemical or electrolytic reduction. Pyrometallurgy uses high temperatures  to convert ore into raw metals, while hydrometallurgy employs aqueous treatment for the same purpose.

Multiple choice chemistry production of metals extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

Metals more reactive than carbon are usually extracted by_________.

  1. Pyrolysis

  2. Electrolysis

  3. Fractional distillation

  4. Filteration
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Metals more reactive than carbon are usually extracted by electrolysis. Electrolysis is the process of breaking down a compound using electrical energy and is needed to extract  the most reactive metals. 

Multiple choice chemistry production of metals extraction of metal from concentrated ore basics of metallurgy extraction of metals from ore

What is the most common type of electrometallurgical processes to obtain pure metal?

  1. Electro-refining

  2. Electrowinning

  3. Both a and b

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

The most common types of electrometallurgical processes are electrowinning and electro-refining. Electrowinning is an electrolysis process used to recover metals in aqueous solution, usually as the result of an ore having undergone one or more hydrometallurgical processes. Electro-refining is used to dissolve an impure metallic anode and produce a high purity cathode.