Question

B) a brown substance 'x' on heating in air forms a compound 'y'. Whenhydrogen gas is passed over 'y', it changes to 'x' again.I. Name substances 'x' and 'y'.Ii. Name the processes occurring during the two changes.Iii. Write the chemical equations involved.

Answer 1

Here brown coloured substance X is copper-- Cu

Y is copper oxide- CuO

Reactions taking place here are oxidation and reduction. Also known as redox reaction.

2Cu + O2 → 2CuO

This is oxidation.

2CuO + H2 →—→ Cu + H2O (when heated)

This is reduction.

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