Question

When the powder of a common metal is heated in

an open china dish, its colour turns black.

However, when hydrogen is passed over the hot

black substance so formed, it regains its original

colour. Based on the above information answer

the following questions:

(i) What type of chemical reaction takes

place in each of the two given steps?

(ii) Name the metal initially taken in the

powder form. Write balanced chemical

equations for both reactions

Answer 1

1.) OXIDATION REACTION
2.)METAL IS COPPER
4CU+O2⁻⁻HEAT⇒2CU20(BLACK)

CU2O+H2⇒2CU+H2O
HOPE THIS HELPS YOU 
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Answer 2

Hey Dear,

That's pretty simple.

● Answers -

(i) First reaction is oxidation and second reaction is reduction.

(ii) Copper is initially taken in powder form.

● Balanced reactions -

(a) Oxidation -

When copper powder is burnt in air in china dish, it is oxidised to copper oxide.

4Cu + O2 --> 2Cu2O

b) Reduction -

When hydrogen is passed over copper oxide, it is again reduced yo copper metal.

Cu2O + H2 --> 2Cu + H2O

Hope I was useful. Keep asking..