bromine
fluorine
chlorine
sulphur
The element common to all acids is
Non stick cooking utensils are coated with
Monazite is an ore of
Carbon diamond and graphite are together called
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
