Answer:
(i) Due to the formation
of a layer of oxide, i.e., Al2O3.
(ii) Na or
Mg are more reactive metals as compared to carbon.
(iii)
(in) In solid NaCI, the movement of ions is not possible due to its rigid
structure but in aqueous solution or molten state, the ions can move freely.
(iv)
They are highly reactive.
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