Give reasons for the following:
$(i)$ Metals conduct electricity.
$(ii)$ Non-metals in general do not displace hydrogen from dilute acids.
$(iii)$ Aluminium easily combines with oxygen but still it can be used for making kitchen utensils.

(N/A) $(i)$ Metals contain free electrons that can move throughout the metallic lattice,allowing them to conduct electricity.
$(ii)$ Non-metals are electron acceptors. To displace hydrogen from dilute acids,electrons must be supplied to the $H^+$ ions of the acid. Since non-metals cannot donate electrons,they cannot displace hydrogen.
$(iii)$ Aluminium reacts with oxygen to form a thin,protective layer of aluminium oxide $(Al_2O_3)$ on its surface. This layer is non-reactive and prevents further oxidation of the underlying metal,making it suitable for kitchen utensils.