1.

Write your observations when the following processes take place:An aqueous solution of sugar is heated to dryness.A saturated solution of potassium chloride prepared at 60° C is allowed to cool at room temperature.a mixture of iron filings and sulphur powder is heated strongly.A beam of light is passed through a colloidal solution.Dil. HCl is added to the mixture of iron and sulphur.

Answer»
  1. Sugar remains as residue in the form of a solid mass.
  2. Potassium chloride crystallises out.
  3. A black coloured compound, FeS (iron sulphide) is formed.
  4. The path of the light becomes visible.
  5. A colourless gas is evolved.


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