What would you observe when

(a) a saturated solution of potassium chloride prepared at 60°C is allowed to cool to room temperature.


(b) an aqueous sugar solution is heated to dryness.


(c) a mixture of iron filings and sulphur powder is heated strongly.


(a) When a saturated solution of potassium chloride prepared at 60°C is allowed to cool to room temperature, crystals of potassium chloride will be formed and get separated out.
(b) Initially, when sugar solution is heated, water gets evaporated. But when heated to dryness, sugar gets charred and turns black.

The chemical equation to show that sugar turns black on continuous dry heating.


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(c) A black coloured compound called iron sulphide is formed when a mixture of iron filings and sulphur powder is heated strongly.


The chemical equation showing the reaction between iron filings and sulphur powder is as follows:
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