Question

1.
State reasons for the following
a) Electric wires are covered with rubber like material.
b) From dilute hydrochloric acid, zinc can liberate hydrogen gas but copper cannou
c) Sulphide ore of a metal is first converted to its oxide to extract the metal from it.
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Answer 1

1. So that the person touching it did not get shock
2. because copper is more reactive than zinc
3. Because sulphide ores can be reduced by froath floatation

Answer 2

Answer:

1. electric wires are covered with rubber so that external factors like wind, air get not contact with them and a person cannot get shock
2. as zinc can replace hydrohen from hydrogen chloride but copper cant so that it cannot produce hydrogen gas
3. they use reduction method using coal or an carbon compound to make as sulphur

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