Chlorination of water for town supply is carried out to

Correct answer: remove germs from the water.

Explanation: Chlorination is a disinfection step. Chlorine (or hypochlorous acid formed in water) kills disease-causing microorganisms, making the water safe to drink.

• make the water colourless — Incorrect. Colour removal is not the main purpose of chlorination.
• remove germs from the water — Correct. Chlorine destroys bacteria and other pathogens.
• make the water tasteful — Incorrect. Chlorine can actually give a slight taste/odour.
• remove odour from the water — Not the primary goal; while chlorine can oxidize some smelly compounds, chlorination is done mainly for disinfection.