The presence of soluble fluoride ion upto 1 ppm concentration in drinking water , is :

The most soluble fluoride in water is

Pollution of water originates mainly from human activities. Mention the adverse effects of high fluoride concentration in drinking water.

Identify the correct statements from the following : i. In the presence of UV light , CF_(2)Cl_(2)(g) gives chlorine free radicals which will react with O_(3) (g) to form O_(2) (g). ii. Drinking water with 10 ppm fluoride is better than drinking water with 1 ppm fluoride. iii. The maximum permissible concentration of lead in drinking water is 50 ppb.

The maximum allowed concentration in ppm of zinc in drinking water

The maximum allowed concentration in ppm of zinc in drinking water