The important ore of aluminium

The gas that usually causes explosions in coal mines is

Which of the following is an iron ore ? 

When water itself combines chemically with some element or mineral it is called 

The total energy of revolving electron in an atom 

Find the odd one:

The chiefsource for the production of nitrogeneous fertilizers is : 

Mercury is a :

A powerful eye irritant present in smog is

The Bhopal tragedy was caused by the gas

Alcoholic (OH) group can be identified by