Question

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Answer 1

Explanation:

a) because zinc is more reactive than copper.

b) sodium and potassium is very reactive metal. the reacts vigorously with air and water. in this reaction many heat is generated .to save them they are stored in kerosene.

c) copper is a metal and a good conductor of electricity. so it is used to make electric wire

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Answer 2

answer:-

(a)$\tt\blue{copper}$ is less reactive than zinc. Therefore, it cannot displace zinc from its salt solution.

(b)$\tt\purple{Na\:and\:k}$are very reactive metals and kept in kerosene oil to prevent it from coming in contact with oxygen and moisture as they react to form their hydroxides. This is an exothermic reaction and lot of heat is generated so both the metals are kept in kerosene oil.

(c)$\tt\red{copper}$ is an excellent conductor of electricity; no other metal can compete with it in terms of electrical conductivity. The wires made of this reddish metal are capable of carrying comparatively more electric current per diameter of wire.