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Depression in Freezing Point

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Question

Why is the extraction of copper from pyrites more difficult than that from its

oxide ore through reduction?

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Solution

The Gibbs free energy of formation (Δ_fG) of Cu₂S is less than that of and. Therefore, H₂ and C cannot reduce Cu₂S to Cu.

On the other hand, the Gibbs free energy of formation of is greater than that of. Hence, C can reduce Cu₂O to Cu.

Hence, the extraction of copper from its pyrite ore is difficult than from its oxide ore through reduction.

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Q. Why is the extraction of copper from pyrites more difficult than that from its oxide ore through reduction?

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

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

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. 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

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.

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