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Q.

Aluminium is extracted and obtained in pure form by electrolysis of ___________.

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a

Al2O3

b

Al2(CO3)3

c

Al2 SO4

d

Al(OH)3

answer is A.

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Detailed Solution

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  • It is easier to obtain metal from its oxide as compared to its sulphide and carbonate. 
  • This is because when we extract metal from its respective ore, we have to perform a calcination or roasting step in which carbonates and sulphides of metals are converted into metal oxides.
  • Hence in the case of oxides, we can skip this step and directly reduce oxides to obtain the metal.
  • Thus aluminium is obtained by the electrolytic reduction of Aluminium oxide (Al2O3).
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