Clear , transparent water is always fit for drinking . Comment.

In agar plate medium having bacteriophages and bacteria, there are clear transparent areas around the growth of bacteria. These areas are called

A water tank has steps inside it. A monkey is sittin on the topmost step (i.e.,the first step). The water level is at the ninth step. After drinking water, he wants to go back. For this, he jumps 4 steps up and then jumps back 2 steps down in every move. In how many jumps will he reach back the top step?

(b) BOD is an index of water pollution. Comment.

Write the chemical formula of bleaching powder, How is bleaching powder prepared ? For what purpose it is used in drinking water ?

Assertion (A): The dissolution of gases in water is always an endothermic process. Reason (R ) : The dissolution of gases in water proceed with a negative value of DeltaS .

(a) Give any three differences between Physisorption and chemisorption (b) (i) Mention the role of alum in the purification of drinking water. (ii) Give an example of an oil dispersed in water emulsion.