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State reasons for the following: (i) Electric wires are covered with rubber like material. (ii)From dilute hydrochloric acid, zinc can liberate hydrogen gas but copper

State reasons for the following:
(i) Electric wires are covered with rubber like material.
(ii)From dilute hydrochloric acid, zinc can liberate hydrogen gas but copper cannot.
(iii) Sulphide ore of a metal is first converted to its oxide to extract the metal from it.

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