Give reasons for the following.
a) Gold and silver are used in jewellery.
b) Aluminium oxide is called an amphoteric oxide.
c) Calcium does not occur in free state in nature.
d) Stainless steel does not rust easily.
e) Zinc does not give hydrogen on reacting with nitric acid.
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Answer:
a) because they are least reactive metals
b) because aluminium oxide shows property of both acid and base
c) because it is very reactive in nature as it is on 3rd no of reactivity series
d) because it is an alloy prepared in such a way that so that it may not rust.
e) because nitric acid is a strong oxidising agent the hydrogen produced get oxidised to water.
Explanation:
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