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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.

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(a) Upon cooling, crystals of potassium chloride would separate.
(b) Initially, entire water slowly gets removed. Upon further heating, sugar gets charred and burning smell will be noticed.
(c ) Iron sulphide is formed as a greyish black residue.

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