Although there are several ores, 80% of the world copper production comes from the ore chalcopyrite ( $C u F e S_{2}$ ). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction. In the self-reduction step, the reducing species is:

S

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O^{2 -}

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S^{2 -}

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S O_{2}

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Solution

The correct option is C $S^{2 -}$
What happens during the self-reduction step?
$C u_{2} S + 2 C u_{2} O ⟶ 6 C u + S O_{2} (g)$

There is a reason why the copper is called 'blister copper'.

Clearly, the metal gets reduced from (+1) oxidation state to 0 (elemental metallic copper).

However, there is no change in the oxidation state of oxygen atoms at all. That leaves us with the sulphide ion
$S^{2 -}$ as the reducing species!

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Similar questions

Q. Although there are several ores, 80% of the world copper production comes from the ore chalcopyrite (

C u F e S_{2}

). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction. Partial roasting of chalcopyrite produces:

Given below is the steps for extraction of Copper from its ore. Write the reactions involved.

(a) Roasting Copper (I) Sulphide.

(b) Reduction of Copper (I) oxide with Copper (I) sulphide

Q. Which of the following reaction involved in extraction of copper from chalcopyrite?

Question 62
(i) Given below are the steps for extraction of copper from its ore. Write the reaction involved.
(a) Roasting of copper (I) sulphide.
(b) Reduction of copper (I) oxide with copper (I) sulphide.
(c) Electrolytic refining.

(ii) Draw a neat and well-labelled diagram for electrolytic refining of copper.

Q. Write the balanced equation for the 'the extraction of copper from copper pyrites by self-reduction.

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Although there are several ores, 80% of the world copper production comes from the ore chalcopyrite (CuFeS2). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction. In the self-reduction step, the reducing species is:

Although there are several ores, 80% of the world copper production comes from the ore chalcopyrite ( $C u F e S_{2}$ ). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction. In the self-reduction step, the reducing species is: