The compound which is used for removing permanent hardness of water is:

The formula of Gypsum and Plaster of Paris is:

The compound which is used as an oxidizing agent in many chemical industries is:

Common salt besides being used in kitchen can also be used as the raw material for making:

(i) washing soda

(ii) bleaching powder

(iii) baking soda

(iv) slaked lime

Which of the following are present in a dilute aqueous solution of hydrochloric acid?