(a) Solid sodium hydrogen carbonate is heated ?(b) Chlorine gas is passed through dry slaked lime (c) Gypsum is heated to a temperature of 373 K?

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Solution

a)NaHCO₃ (Sodium bicarbonate or sodium hydrogen carbonate) on heating produces CO₂ which extinguishes fire, so it is used as fire extinguisher.
Chemical reaction

2NaHCO₃ + Heat → CO₂+ Na₂CO₃ +H₂O

b) Ca(OH)₂ + Cl₂→ CaOCl₂ + H₂O

c) On heating gypsum at 373 K, it loses water molecules and becomes calcium sulphate hemihydrate ( CaSO₄. 1/2 H₂O). This is called Plaster of Paris.

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