Rekha's mother adds Phitkari (Alum) to water collected from the pond every day in order to

Correct option is A

The correct answer is sediments light suspended impurities.
Aluminium Sulphate, shortly known as Alum, when added to raw water reacts with the bicarbonate alkalinities present in water and forms a gelatinous precipitate. The water over this sediment is almost clean other than some fine particles dissolved in it. So Rekha's mother adds Phitkari (alum) to water collected from the pond every day in order to sediment light suspended impurities. Sedimentation is the process for removing sand particles from water. Light suspended materials can be removed by adding phitkari.