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Concentration of Ore

The most elec...

Question

The most electropositive metals are isolated from their ores by ___________.

A

High temperature reduction with carbon

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B

Self-reduction

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C

Thermal decomposition

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D

Electrolysis of fused ionicsalts

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Solution

The correct option is B Electrolysis of fused ionicsalts
The most electropositive metals are isolated from their ores by electrolysis of fused ionic salts. In the electrolysis process the ionic salts are ionized by electrolysis by applying electric current in the electrolytic device.

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Q. Match the column I with column II and mark the appropriate choice.

	Column I		Column II
(A)	Highly electropositive metals	(i)	Carbon reduction
(B)	Copper	(ii)	CO reduction
(C)	Iron	(iii)	Self reduction
(D)	Zinc	(iv)	Electrolysis

Q. Most electropositive metals are obtained from their ores by:

Q. The process of isolation of metals by dissolving the ore in a suitable chemical reagent followed by precipitation of the metal by a more electropositive metal is called :

Q. A metal obtained by auto reduction or self reduction _______________.

Reduction to free metal: some of the methods commonly used to get free metal from the concentrates ore are below.

Smelting: The process of extracting a metal in the state of fusions is called smelting. In this process, the ore is mixed with carbon and heated in a suitable furnace

Electrolytic reduction process: This process is used in the extraction of the alkali and alkaline earth metals, zinc and aluminium.

Self-reduction process: The sulphide ores of less electropositive metals like Hg, Pb, Cu etc., are heated in the air so as to convert part of the ore into oxide or sulphate which then reacts with the remaining sulphide ore to give the metal.

The metal extracted by electrolysis of its fused salt is :

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