Number of unpaired electrons in the ground state of the carbon atom is
2
3
4
1
Destructive distillation of coal does not give
Coke
Gas carbon
Carbides
Coal-tar
Annealing is best described as
Slow and gradual cooling
Sudden and rapid cooling
Cooling by water
Very slow cooling
For complete combustion of a fuel we shall need
High temperature
An excess of air
High air pressure
An excess of air and high temperature
Ordinary glass is
Sodium silicate
Copper silicate
Calcium silicate
A mixture of calcium and sodium silicates with silica
In group IVA or 14 of the extended form of the periodic table, with increase in atomic number, the metallic character.
Increase
Decrease
Remains the same
First increases then decreases
If CO2 is passed in excess into limewater, the milkiness first formed disappears due to.
Reversal of the original reaction
Formation of volatile calcium derivative
Formation of water soluble calcium bicarbonate
The solution getting heated by exothermic reaction
An important ore of lead is
Magnesite
Carnallite
Bauxite
Galena
CO forms a volatile compound with
Nickel
Copper
Sodium
Aluminium
Which of the following halides is least stable and has doubtful existence?
CI4
SnI4
GeI4
PbI4
