____________ exists as a diatomic molecule .
Neon
Argon
Fluorine
Mercury
__________ gms of oxygen react with 240gms of magnesium. (The chemical reaction is 2Mg+O2→2MgO).
120
80
160
90
__________ is a tetravalent radical.
Hydrogen
Magnesium
Boron
Silicon
When Barium chloride reacts with sulphuric acid gives BaSO4 and __________.
HCl
Cl2
H2
SO2
____________ is the chemical formula of ammonium chloride.
NH2Cl
NH4Cl
NH3Cl
N2HCl
The formula of ozone is _________.
O3
O2
O5
O
NaHCO3 is called _____________.
sodium carbonate
sodium bicarbonate
sodium tricarbonate
none
Magnesium reacts with oxygen and forms____________.
Magnesium dioxide
Magnesium trioxide
Magnesium oxide
None
__________ is an example of radical.
Na
Mg
Mg2+
Cl
CO2 contains one atom of carbon and two atoms of oxygen, the atomic weight of carbon is 12 and the atomic weight of oxygen is 16. The molecular weight of CO2 is
22
36
44
59
