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Chemistry

Grade-10

Easy

Question

Which of the following statements are correct?

Steel is made from hematite ore through chemical processes that include reduction and oxidation.
The electrolyte in the Hall-Heroult method is a molten combination of alumina and cryolite or fluorspar.
Carbon reduction and self-reduction are used to recover lead from its main ore galena
All the above

hint Hint:

See the procces of extraction of elements from ore like hall heroults process

The correct answer is: All the above

In the extraction of aluminium by electrolytic process, alumina Al2O3 is used along with fluorspar and cryolite. Cryolite reduces the melting temperature of the mixture, and also act as solvent to help dissolve Al2O3.

Lead is extracted from its chief ore galena by both carbon reduction as well as self-reduction.

$2 P b S + 3 O_{2} \to 2 P b O + 2 S O_{2}$
$P b S + 2 P b O \to 3 P b + S O_{2}$ (self reduction)
$P b O + C \to P b + C O$
$P b O + C O \to P b + C O_{2}$ (carbon reduction)

Firstly carbon which is added along with crushed hematite ore is oxidized to $C O$ and $C O_{2}$ and the second the produced $C O$ acts as a chief reducing agent for the reduction of haematite to steel.

So all the above

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