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Extraction of Moderately Reactive Metals

The process w...

Question

The process which removes volatile impurities from calamine is:

A

caleation

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B

roasting

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C

calcination

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D

smelting

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Solution

The correct option is B roasting
Calamine is zinc carbonate, containing impurities which are removed by the roasting process. Roasting is heavy heating in the presence of oxygen to remove volatile impurities and leave relatively pure ore as precipitate.

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Q. The process which removes volatile impurities from calamine is called calcination.

Q. Calcination is a process in which the ore is heated strongly in the absence of air to remove volatile impurities. It thermally decomposes the carbonate.

A l_{2} O_{3} . 2 H_{2} O C a l c i n a t i o n - ------ \to B + 2 H_{2} O

The name of product

B

Q. In polling, wood gas is responsible for the removal of volatile impurities.

Q. Fill in the blanks with the correct choice.
The undesired impurities present in the ores are called ___(i)___. To remove the volatile impurities from the ore, the ___(ii)___ process is carried out. Flux combines with non-fusible impurities to form ___(iii)___.

C a O

acts as a ___(iv)___ flux.

State the given statement is true or false.

Statement: In calcination and roasting, volatile impurities are removed.

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