निम्नलिखित पदों

The function of skimming tank in sewage treatment is to remove 

Which one of the following is known as the brown coal?

KMN04 can be used as a/an

Burning pyrites ore gives out 

Spirit in contact with body gives cool sensation because it is:

The mass number of a nucleus is

The most reactive among the halogens is 

When a spoon is to be electroplated with nickel the spoon is

Ozone layer is present in

The total energy of revolving electron in an atom