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Text Solution
Solution : (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. <br> (b) Initially, sugar will obtained as water wil get evaporated. But on dry heating sugar gets charred and it turns back. <br> `C_(12)H_(22)O_(11)overset(triangle)(to)underset((Black))(12C)+11H_(2)Ouarr.` <br> (c) The black coloured compound, iron sulphide is formed when a mixture of iron filings and sulphur powder is heated strongly. <br> `underset("Iron filings")(Fe)+underset("Sulphur powder")(S) overset(triangle)(to) underset("Iron sulphide")(FeS)`
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Answer:
(a) Sodium potassium chloride will separate out from the saturated solution when the temperature of the solution reduced from 60°C to room temperature. The solubility of the solid-state is affected by the change in temperature.
(b) When aqueous sugar solution is heated first water gets evaporated up to some extent then sugar gets charred.
(c) Iron combines with sulphur and forms iron sulphide (FeS).
When iron filings and sulphur powder are mixed and heated they undergo a chemical reaction and form ferrous sulphide (FeS). It is a new substance which has properties entirely different from Fe and S.
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