Annealing is best described as
Slow and gradual cooling
Sudden and rapid cooling
Cooling by water
Very slow cooling
Which of the following is the chemically inactive allotropic form of carbon?
Diamond
Coal
Charcoal
Animal charcoal
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
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
Identify the correct statement with respect to CO
It combines with water to give carbonic acid
It combines with haemoglobin of the blood
It is a powerful oxidizing agent
It is used to prepare aerated water
Number of unpaired electrons in the ground state of the carbon atom is
2
3
4
1
CO forms a volatile compound with
Nickel
Copper
Sodium
Aluminium
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
