An important ore of lead is
Magnesite
Carnallite
Bauxite
Galena
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
Destructive distillation of coal does not give
Coke
Gas carbon
Carbides
Coal-tar
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
Which of the following is the chemically inactive allotropic form of carbon?
Diamond
Coal
Charcoal
Animal charcoal
Graphite is a good conductor of electricity because it contains
Bonded electrons
Mobile electrons
Strong C = C bonds
Sp2 hybridization
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
Glass is soluble in
HF
H2SO4
HCIO4
Aqua- regia
An alloy, which does not contain copper is
Bell metal
Brozone
Brass
Solder
