Answer:
(a)is an oxidizing
agent.
When aluminium is dipped in HN03, an
oxide layer of aluminium is formed on the surface of the metal, which prevents
it from further reaction. Thus, reactivity of Al decreases.
(b) Na, Mg, etc., metals are
quite reactive and present towards the top of the reactivity series. Hence,
their affinity with oxygen is higher than carbon.
Therefore, their oxides are
stable. To reduce them with carbon, very high temperature is required and at
that temperature they will form their corresponding carbides. Hence, their
oxides cannot be reduced by carbon.
(c) Ions ofcannot move
to carry the charge in dry or solid state as they are fixed. But they are free
in molten state and in aqueous solution to carry the charge and hence,conducts
electricity in molten state.
(d) In galvanization a thin
layer of zinc is formed over the iron articles by dipping them in molten zinc,
which prevents iron from corrosion as zinc is more reactive than iron.
(e) These metals are quite
reactive so they cannot exist in Free State and hence, they are found in nature
in the form-of their compounds.
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