Carbogen is
mixture of O2 + 5 - 10% CO2.
used by pneumonia patient for respiration
used by victims of CO poisoning for respiration
All of the above
A hydride of nitrogen which is acidic is
NH3
N2H4
N2H2
N3H
PH3, the hydride of phosphorus is
metallic
ionic
non-metallic
covalent
Graphite is a soft, solid lubricant,extremely difficult to melt. The reason for this anamolous behaviour is that, graphite
is an allotropic form of diamond
has molecules of variable molecular masses like polymers
has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak inter plate bonds
is a non-crystalline substance.
Which of the following is most stable ?
Sn2+
Ge2+
Si2+
Pb2+
Carborundum is obtained when silica is heated at high temperature with
carbon
carbon monoxide
carbon dioxide
calcium carbonate
Red lead is
PbO
Pb3O4
PbO2
Pb4O3
The mixture of conc.HCl and HNO3 made 3:1 ratio contains
ClO2
NOCl
NCl3
N2O4
Which is not a mineral of aluminium?
Anhydrite
Bauxite
Corundum
Diaspore
Nitrogen shows different oxidation states in the range
0 to +5
-3 to +5
-5 to +3
-3 to +3
