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
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
Graphite is a good conductor of electricity because it contains
Bonded electrons
Mobile electrons
Strong C = C bonds
Sp2 hybridization
Annealing is best described as
Slow and gradual cooling
Sudden and rapid cooling
Cooling by water
Very slow cooling
CO forms a volatile compound with
Nickel
Copper
Sodium
Aluminium
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 alloy, which does not contain copper is
Bell metal
Brozone
Brass
Solder
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
Glass is soluble in
HF
H2SO4
HCIO4
Aqua- regia
Number of unpaired electrons in the ground state of the carbon atom is
2
3
4
1
