Rutile
Haematite
Limestone
Pitchblende
What is laughing gas
Actinides are the elements with atomic numbers from
The two elements that are frequently used for making transistors are
The filament of an electric bulb is made of
Diamond is an allotropic form of
In fireworks, the green flame is produced because of
Permanent hardness of water can be removed by adding
Marsh gas is
LPG consists of mainly
Air is a/an
