Question

Aluminium and copper are extracted from their oxide and sulphide ores respectively. Which of the
following is correct?
(1) 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) Smelting process (reduction with carbon) is also used for Aluminium.
(IV) Sulphide ores of copper are difficult to be reduced than the oxide ores.
(1) I, II and IV (2) I and III
(3) II and III
(4) II and lV

Answer 1

Explanation:

2.) 1 and 3

hope you GET it

Answer 2

Option 1 and 2 and 4 are correct.

Explanation:

• Aluminium is a very electropositive element.

• This aluminium is found mainly as oxide in ores called as bauxite.

• Bauxite is purified and then electrolysis is involved how to extract aluminium from bauxite.

• Copper is comparatively less electropositive than aluminium.

• In the Bessemer converter, copper sulphide is partly oxidized into copper oxide and then they are heated.

• There copper oxide reacts with copper sulphide to produce metallic copper and Sulphur dioxide gas.

• This process is called autoreduction where copper oxide is reduced to copper by copper sulphide.

• Aluminium is a very electropositive element.

• So reduction of Aluminium oxide by other metals is although chemically possible but theoretically it's very expensive.

• Since sulphide ores of copper is difficult to reduce that's why in Bessemer converter copper is partly converted into oxide where the auto reduction can take place.

For more information about metallurgy,

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Zinc granules were added to zinc sulphate, copper sulphate, aluminium sulphate and iron sulphate

solutions as shown below. A student would observe the deposition of metal on zinc in beakers :

1

(A) I and Ill (B) 1 and IV

(C) 11 and Ill (13) 11 and IV

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Copper (c) aluminium (d) Zinc