Which one of the following properties is not generally exhibited by ionic compounds?

Give reasons for the following:
$(i)$ Gold and platinum are used in jewellery.
$(ii)$ Copper cannot displace hydrogen from dilute acids.
$(iii)$ Stainless steel does not rust easily.
$(iv)$ Metals can be given different shapes according to our needs.
$(v)$ Zinc does not give hydrogen gas on reacting with $HNO_3$.

Which of the following ores is in the form of sulphide?

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

$X$	$Y$
$1.$ Dehydrating agent	$p.$ Sulphur dioxide gas
$2.$ In preparation of firecrackers	$q.$ Concentrated sulphuric acid
$3.$ Weak bleaching agent	$r.$ Dihydrogen gas
$4.$ Lightest gas	$s.$ Sulphur

Why should metal sulphides and carbonates be converted to metal oxides during the process of metal extraction?

Which among the following alloys contains mercury as one of its constituents?