Q7 of 58 Page 32

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

Nitrogen is an antioxidant which prevents oxidation. By keeping food in airtight containers by adding nitrogen helps to slow oxidation.


By keeping the fat/oil containing food materials in an open area or by adding oxygen can cause rancidity.

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5

The coating formed on the metals such as iron, silver and copper after corrosion will be:

 6

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

 8

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

 9

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