Annealing is best described as
Slow and gradual cooling
Sudden and rapid cooling
Cooling by water
Very slow cooling
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
Ordinary glass is
Sodium silicate
Copper silicate
Calcium silicate
A mixture of calcium and sodium silicates with silica
Destructive distillation of coal does not give
Coke
Gas carbon
Carbides
Coal-tar
Which of the following halides is least stable and has doubtful existence?
CI4
SnI4
GeI4
PbI4
Glass is soluble in
HF
H2SO4
HCIO4
Aqua- regia
Which of the following statements is not correct?
Lead salts are slow poisons
Lead metals is used in accumulators
Plumbosolvency increases by the presence of carbonates, sulphate, phosphates etc.
Lead is a soft metal
An alloy, which does not contain copper is
Bell metal
Brozone
Brass
Solder
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
