Roasting of copper pyrites ores is for the following purposes:

To burn off sulphur, arsenic, antimony etc. as oxides and convert all the iron and copper to their oxides

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To burn off arsenic, antimony etc. as oxides and burn off sulphur so that enough of it remains to combine with all the copper

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To burn off sulphur partially to leave enough to combine with arsenic, antimony etc. and to convert all the iron and copper to oxides

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To melt arsenic and antimony sulphides etc. and remove them by liquation and to burn off sulphur partially to leave enough to combine with copper and iron

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Solution

The correct option is C To burn off sulphur partially to leave enough to combine with arsenic, antimony etc. and to convert all the iron and copper to oxides
Roasting: The process in which the concentrated ore is heated in blast of air and ore gets converted into oxide and impurities like sulphur, arsenic are also oxidised to their oxides and removed is called Roasting. It requires very high temperature and specialized furnace like Bessemer or reverberatory furnace.

Rreaction:
$C u_{2} S . F e_{2} S_{3} + O_{2} \to C u_{2} S + 2 F e S + S O_{2}$
$C u_{2} S + 3 O_{2} \to C u_{2} O + 2 S O_{2} $

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Similar questions

Q. Consider the following statements: Roasting is carried out to :
(i) Convert sulphide to metal oxides and

S O_{2}

(ii) Remove water of hydration
(iii) melt the ore
(iv) Remove arsenic and sulphur impurities
of these statements :

Q. Roasting is carried out to :

1) convert sulphide to oxide and sulphate.
2) remove the water of hydration.
3) melt the ore.
4) remove arsenic and sulphur impurities.

Choose the correct options.

Q. Antimony and arsenic belong to the category of:

Q. An ore contains arsenic and antimony as impurities. How are they removed during the process of roasting?

Q. Consider the following statements. Roasting is carried out to:
(i) convert sulphide to oxide and sulphate.
(ii) to remove impurities of

C u S

and

F e S

present in the ore of tin stone

(S n O_{2})

C u S O_{4}

and

F e S O_{4}

.
(iii) melt the ore.
(iv) remove arsenic and sulphur impurities.
Of these statements:

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