Give reason for the following :
Aluminium is extracted from its oxide by electrolytic reduction and not by conventional reducing agents.

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Solution

Aluminium is a good reducing agent and has a great affinity with oxygen.
Therefore, we use electrometallurgy to extract aluminium from its oxide.
Electrometallurgy is a process in which metal is extracted using electricity.

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State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.

Give reasons for the following :

(a) Electrolysis of molten lead bromide is considered to be a reaction in which oxidation and reduction go side, i.e., a redox reaction.

(b) The blue colour of aqueous copper sulphate fades when it is electrolysed using platinum electrodes.

(d) Aluminium is extracted from its oxide by electrolytic reduction and not by conventional reducing agents.

(e) The ratio hydrogen and oxygen formed at the cathode and anode is 2: 1 by volume.

(f) In the electrolysis of acidified water, dilute sulphuric acid is preferred to dilute nitric acid for acidification.

(g) Ammonia is unionised in the gaseous state but in the aqueous solution, it is a weak electrolyte.

(h) A graphite anode is preferred to other inert electrodes during electrolysis of fused lead bromide.

(i) For electroplating with silver, silver nitrate is not used as the electrolyte.

(j) Carbon tetrachloride is a liquid but does not conduct an electrolyte.

(k) Potassium is not extracted by electrolysis of its aqueous salt solution.

Q. How electrolysis can be used in extraction of aluminium? Why aluminium cannot be reduced by conventional reducing agents?

(a) For the reduction of a metal oxide, suggest a reducing agent other than carbon.
(b) Explain why an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.

Q. Assertion :Magnesium is extracted by electrolytic reduction. Reason: All metals are extracted by electrolytic reduction.

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Give reason for the following :Aluminium is extracted from its oxide by electrolytic reduction and not by conventional reducing agents.

Aluminium is a good reducing agent and has a great affinity with oxygen.Therefore, we use electrometallurgy to extract aluminium from its oxide.Electrometallurgy is a process in which metal is extracted using electricity.

Give reason for the following :
Aluminium is extracted from its oxide by electrolytic reduction and not by conventional reducing agents.

Aluminium is a good reducing agent and has a great affinity with oxygen.
Therefore, we use electrometallurgy to extract aluminium from its oxide.
Electrometallurgy is a process in which metal is extracted using electricity.