Answer:
(a) When a saturated solution of potassium chloride
prepared at 60'C is allowed to cool at room temperature, crystals of potassium
chloride will be formed.
(b) Initially, sugar will obtained as water will get
evaporated. But on dry heating sugar gets
charred and it turns black.
(c) The black coloured compound, iron sulphide is formed
when a mixture of iron filings and sulphur powder is heated strongly.
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