Explain why chlorine is used for sterilizing drinking water supply.

Name the raw material used for the preparation of plaster of Paris.

Which property of plaster of Paris is utilized in making casts for broken limbs in hospitals?

Write the formulae of sodium chloride and sodium carbonate. Explain why an aqueous solution of sodium chloride is neutral but an aqueous solution of sodium carbonate is basic (or alkaline). Write chemical equations of the reactions involved.

Write the chemical formula of ammonium chloride. Explain why an aqueous solution of ammonium chloride is acidic in nature? Illustrate your answer with the help of a chemical equation.