Tag: extraction of metals from ore

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

During melting of ice, the temperature of the ice does not change until the ice melts. The heat is used up in :

  1. changing the state overcoming the forces of attraction

  2. changing the state without overcoming the forces of attraction

  3. releasing into atmosphere

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

The heat is used up in changing the state overcoming the forces of attraction.

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

Prior to reduction, metal sulphide and carbonates are converted into oxides because:

  1. carbonates, sulphides are heavy molecules

  2. it is easier to obtain a metal from its oxide as compared to its sulphides and carbonates

  3. it is easy to heat oxide compared to sulphides and carbonates
  4. both $A$ and $B$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

It is easier to obtain a metal from its oxide, as compared to its sulphides and carbonates. Therefore, prior to reduction, the metal sulphides and carbonates must be converted to metal oxides.

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

Ores contain a large amount of impurities, which is called as:

  1. ore

  2. gangue

  3. dust

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

Ores contain large amount of impurities, which is called as gangue. The process of removing of impurities by physical means of methods like hand picking, crushing or pulverizing and grinding) is called dressing of ore.

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

What is electrolysis$?$

  1. Decomposition of substance by passing electricity

  2. Decomposition of substance by heating

  3. Decomposition of substance by redox reaction

  4. Addition of hydrogen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Electrolysis is the process of decomposition of a substance by passing electricity through it in a molten or dissolved state. 

For example, Electrolysis of fused magnesium chloride gives magnesium at cathode and chlorine at the anode.

Hence, the correct option is $A$

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

Define roasting.

  1. Heating of sulphide ores in the presence of excess air to convert them into oxides

  2. Heating of carbonate ores in the limited supply of air to convert them into oxides

  3. Heating of oxides of metals to turn them into metal

  4. Heating of carbonate ores in the limited supply of air to convert them into sulphide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ores found in the form of sulphide and carbonates are first converted to their oxides by the process of roasting and calcination. Heating of sulphide ores in the presence of excess air to convert them into oxides is known as roasting.