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OR
(b) Give reasons :
(i) Metal sulphides and carbonates should be converted to their metal oxides in the process of extraction of metals.
(ii) Aluminium oxide is considered as an amphoteric oxide.
(iii) Metals like $\ce{Na}$, $\ce{K}$, $\ce{Ca}$ and $\ce{Mg}$ are never found in their free state in nature.
(b) Give reasons :
(i) Metal sulphides and carbonates should be converted to their metal oxides in the process of extraction of metals.
(ii) Aluminium oxide is considered as an amphoteric oxide.
(iii) Metals like $\ce{Na}$, $\ce{K}$, $\ce{Ca}$ and $\ce{Mg}$ are never found in their free state in nature.
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OR
(b) (i) It is easier to obtain metal from its metal oxide / It is easier to reduce metal oxide to metal.
(ii) Aluminium Oxide can react with both acids as well as bases to form salt and water.
$\ce{Al2O3 + 6HCl -> 2AlCl3 + 3H2O}$
$\ce{Al2O3 + 2NaOH -> 2NaAlO2 + H2O}$
(iii)As they are highly reactive metals so exist in combined state.
(b) (i) It is easier to obtain metal from its metal oxide / It is easier to reduce metal oxide to metal.
(ii) Aluminium Oxide can react with both acids as well as bases to form salt and water.
$\ce{Al2O3 + 6HCl -> 2AlCl3 + 3H2O}$
$\ce{Al2O3 + 2NaOH -> 2NaAlO2 + H2O}$
(iii)As they are highly reactive metals so exist in combined state.