Explain the following : -
(a) Metals like Na, Ca and Mg are never found in free state in nature ?
(b) Solder is used for welding electrical circuit.
(c) Silver ornaments turn blakish after some time.
(d) Iron oxide is an amphoteric oxide?
(e) Hydrogen gas is not evolved when Fe metal reacts with nitric acid.
Answers
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a- because they are highly reactive
c- Silver is least reactive but it turns into black after some time beacuse of oxide layer on it
c- Silver is least reactive but it turns into black after some time beacuse of oxide layer on it
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Answer:
a) because they are highly reactive
b) low mp
c) corrosion , formation of silver sulphide
d) shows acidic as well as basic nature
e) hno3 is a strong oxidising agent
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