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Subject :NSO    Class : Class 7

Observe the given Venn diagram carefully and identify the processes represented by points 1, 2 and 3.

1 2 3
A Burning of fossil fuel Boiling potatoes Baking a cake
B Lighting a kerosene stove Breaking of an egg shell Photosynthesis
C Burning of paper Rusting of iron Spoilage of food
D Burning of LPG gas in kitchen Crystallisation of copper sulphate Browning of cut slices of apple

how can a physican and chemical change occur in one change only ?

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