Aluminium and copper are extracted from their oxide and sulphide ores respectively. Which of the following is correct ?
I. Copper is extracted by the auto reduction of copper oxide by copper sulphide.
II. Aluminium cannot be obtained by chemical reduction due to its strong affinity for oxygen.
III. In electrometallurgy of $A l$ , graphite is used as cathode to avoid reoxidation of $A l$ into $A l_{2} O_{3}$ by preventing formation of $O_{2}$ .
IV. Sulphide ores of copper are difficult to be reduced than the oxide ores.

I, I I, I V

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I I

and

I I I

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I I I

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I I

and

I V

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Solution

The correct option is A $I, I I, I V$
In the electrometallurgy of $A l$ , graphite is used as anode as oxygen being a non-metal is liberated at the anode and the reoxidation of $A l$ into $A l_{2} O_{3}$ is avoided.

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Similar questions

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

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.

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. In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with :

Q. Which of the following statements is correct?
(i) Copper is extracted by hydrometallurgy from low-grade ores.
(ii) In the electrolytic reduction of alumina, graphite is acting as an anode and steel vessel with the lining of carbon acts as an anode.
(iii) In Hall-Heroult process, aluminium is obtained at anode and CO and

C O_{2}

are produced at the cathode.

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The correct option is A I,II,IVIn the electrometallurgy of Al, graphite is used as anode as oxygen being a non-metal is liberated at the anode and the reoxidation of Al into Al2O3 is avoided.

The correct option is A $I, I I, I V$
In the electrometallurgy of $A l$ , graphite is used as anode as oxygen being a non-metal is liberated at the anode and the reoxidation of $A l$ into $A l_{2} O_{3}$ is avoided.