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Smelting

Which of the ...

Question

Which of the following pairs is not correctly matched with respect to the extraction of metals from their ores?

A

Leaching process - Silver and gold from their native ores

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B

Self reduction - Copper and mercury from their sulphide ores

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C

Carbon / Carbonmonoxide reduction - Iron and zinc from their oxide ores

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D

Electrolytic reduction - Aluminium and tin from their oxide ores

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Solution

The correct option is D Electrolytic reduction - Aluminium and tin from their oxide ores
Tin is obtained from its ore cassiterite, $S n O_{2}$ by carbon reduction.
$S n O_{2} + 2 C \to S n + 2 C O .$
Except the above, all are correctly matched.

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Similar questions

Q. The reaction given below represent the processes of reduction to obtain metals from their respective ores.
Arrange them in the following order.
Sodium, aluminium, zinc, chromium, iron, copper and mercury
(a) Metal oxide

+

\to

+ {S O}_{2}

(b) Metal oxide

+ C O \to

+ {C O}_{2}

(c) Metal oxide

+ C \to

+ C O

(d) Metal oxide

\to

+ O_{2}

(e) Metal oxide

Δ - \to

+ O_{2}

(f) Metal oxide

+

\to

Aluminium oxide

+

metal
(g) Metal chloride

\to

+

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.

Q. In which of the following pair of metals, both are commercially extracted from their respective ores by carbon reduction method?

Q. Assertion :Activity series of metals plays a role in extraction of metals from their oxides. Reason: When the electrodes (metals and non-metals) in contact with their ions are arranged on the basis of the values of their standard reduction potentials or standard oxidation potentials.

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

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