Q8 of 58 Page 32

The colour formed on the surface of copper powder when it is heated in a china dish:

The colour formed on the surface of copper powder when it is heated in a china dish is black. Oxidation of copper takes place. As a result, copper oxide is formed which is black in colour.

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The changes which take place when fats and oils are oxidised:

 7

The substances which get oxidised easily can be kept for longer duration by:

 9

What happens when hydrogen gas is passed over the heated copper oxide (CuO)?

 10

The reaction which is used in black and white photograph is: