Question

1. Give reasons :
(a) Why is pure gold not suitable for making ornaments ?
(b) Why calcium is found in the form of compound ?
(c) Why electrical wires are coated with PVC (Poly Vinyl Chloride) ?
(d) Why do we apply oil on iron tools kept in storage ?
(e) Why sodium is stored in kerosene oil ?
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Answer 1

Answer:

1. pure gold is not suitable for making ornaments because it's is so soft. that is why it is mixed with copper or silver
2. Calcium is found in the form of compound because -The calcium is one of the most easily available chemical elements in our planet but most of the naturally available mineral is in the form of chemical compounds. Natural availability of calcium in element state,is very rare
3. they are highly versatile. ... PVC insulated wires are most useful for cable insulation.
4. to prevent it from corrosion and rusting.
5. so that no reaction takes place