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1. Svante Arrhenius proposed the theory of acid-base.
 
2. Calcium sulphate is used in making chalks and also helps in setting fractured bones during surgery.
 
3. \((CaSO_4)_2.H_2O + 3H_2O\) is the product obtained when \(2CaSO_4.2H_2O\) is heated to \(373K\).