question_answer 36)

  What would you observe when (a) a saturated solution of potassium chloride prepared at 60°C is allowed to cool at room temperature? (b) an aqueous sugar solution is heated to dryness? (c) a mixture of iron filings and sulphur powder is heated strongly?

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.