Answer:
(i)
Metals are found in the forms of both free and combined states.
(ii) Reaction of metal with oxygen All metals combine with oxygen to form
metal oxides.
For example, when copper is heated in air, it combines
with oxygen to form copper oxide.
i.e., 
(1)
Reaction of metals with water Metals like sodium react
with cold water, magnesium with hot water and iron with steam.
(1)
(1)
(1)
Reaction of metal with acids Metals react with acids to
form salt and evolve hydrogen gas. For example, magnesium reacts with dilute hydrochloric
acid to form magnesium chloride
and evolve 
.
(1)
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