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05/11/2020 5:41 pm
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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 cannot.
(iii) Sulphide ore of a metal is first converted to its oxide to extract the metal from it.
1 Answer
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05/11/2020 5:42 pm
(i) It is because rubber is an insulator and does not allow current to flow through it.
(ii) Zinc is more reactive than hydrogen. Therefore, it can displace hydrogen from dilute HCl whereas copper cannot, because it is less reactive than hydrogen.
(iii) It is because it is easier to reduce oxide ore as compared to sulphide ore.