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
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
When steam is passed through red hot coke
CO2 and H2 are obtained
CO and B2 are formed
CO and H2 are obtained
Petrol gas is obtained
CO forms a volatile compound with
Nickel
Copper
Sodium
Aluminium
Ordinary glass is
Sodium silicate
Copper silicate
Calcium silicate
A mixture of calcium and sodium silicates with silica
Which one of the oxides is neutral?
CO
SnO2
AnO
SiO2
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
Number of unpaired electrons in the ground state of the carbon atom is
2
3
4
1
Glass is soluble in
HF
H2SO4
HCIO4
Aqua- regia
