Mercury is a :
The chemical bahaviour of an atom depends upon
The chief source of naphthalene is
Burning pyrites ore gives out
Which of the following is an iron ore ?
Spirit in contact with body gives cool sensation because it is:
Which gas is used for converting vegetable oils into saturated fats?
The function of skimming tank in sewage treatment is to remove
The mass number of a nucleus is
The most abundant constituent of atmospheric air is
