allotropes
isomers
isomorphs
isotopes
Potassium nitrate is used in
Permanent hardness of water may be removed by the addition of
Soda water contains
The most important ore of aluminium is
Most soluble in water is
Which of the following was to be discovered first in the chromospheres of the sun
Which of the following is in liquid form at room temperature
Sodium metal is kept under
Which are the ingredients of gunmetal
From which mineral is radium obtained
