Which method is used for the refining of metals having low melting points?

Name two metals which are found in nature in the free state.

Distinguish between the following:
$(i)$ Electrolytic reduction and electrolytic refining
$(ii)$ Mineral and ore
$(iii)$ Alloys and amalgams

$(a)$ 'Sodium is a highly reactive metal and it cannot be obtained from its oxide by heating with carbon'. Give reason.
$(b)$ How can sodium be obtained from sodium chloride?

Make the correct pairs from below mentioned $X$ and $Y$:

$X$	$Y$
$1$. Extraction of sulphur	$p$. Contact process
$2$. Production of nitric acid	$q$. Frasch method
$3$. Production of sulphuric acid	$r$. Haber's process
$4$. Production of ammonia gas	$s$. Ostwald's method

During the extraction of metals,electrolytic refining is used to obtain pure metals.
$(a)$ Which material will be used as the anode and cathode for the refining of silver metal by this process?
$(b)$ Suggest a suitable electrolyte as well.
$(c)$ In this electrolytic cell,where do we get pure silver after passing an electric current?