Zinc reacts with HCl to give zinc chloride and ____________.
Hydrogen
Chlorine
Zinc
None
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
__________ gms of oxygen react with 240gms of magnesium. (The chemical reaction is 2Mg+O2→2MgO).
120
80
160
90
Hg is the symbol of ___________.
mercury
gold
silver
tin
__________ is a tetravalent radical.
Magnesium
Boron
Silicon
Calcium carbonate reacts with Hydrochloric acid and gives _________ ,water and CO2..
Calcium oxide
Calcium hydroxide
Calcium chloride
____________ exists as a diatomic molecule .
Neon
Argon
Fluorine
Mercury
Cations are ___________.
electropositive
electronegative
neutral
none
'H2' stands for a molecule of hydrogen consisting of __________ hydrogen atoms.
1
2
3
4
Magnesium reacts with oxygen and forms____________.
Magnesium dioxide
Magnesium trioxide
Magnesium oxide
