Question

effect of heat on Crystals of ferrous sulphate observe the colour of the substance in the cold test tube
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Answer 1

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The ferrous sulphate crystals are light green in colour. The gas emitted has the characteristic odour of burning sulphur. On heating, the colour changes from light green to white. If it is heated further, the white substance changes its colour to dark brown solid.

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Answer 2

effect of heat on crystal of ferrous sulphate is that it will lose its water of crystallization and become white in colour

when we observe the colour of ferrous sulphate crystal in cold test tube it is blue in colour