Answer:
(a)
The ionisation energy of metals is higher than hydrogen, so they can replace
hydrogen from metal whereas ionisation energy of non-metal is lower than that
of hydrogen hence they cannot displace hydrogen from acids. (1)
(b) Calcium is very reactive and combine with oxygen or water vapour
present in air to form compounds.
Hence these metals are not found in the free state in nature.
(1)
(c) Zinc is used in the galvanisation of iron because zinc
being more reactive metal than iron will get oxidised first as it is coated
over the surface of iron. Thus, iron is prevented from rusting.
Copper is less reactive than iron hence it will not react
with iron and does not form any oxide layer on it. (1)
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