The most abundant component in Earth’s atmosphere (or Air) is
A. Hydrogen
B. Oxygen
C. Nitrogen
D. Carbon dioxide
The percentage by mass of any element is calculated with the help of
A. Formula of compound only
B. Relative atomic masses only
C. Nucleon number
D. Formula of compound and relative atomic masses
Chloro fluoro Carbons (CFCs) are not
A. Flammable only
B. Toxic only
C. Harmful Flammable and toxic
D. Non-flammable
One of three p-orbitals on nitrogen atom overlaps with pi bonding system in ‘benzene ring’ in the molecule of.
A. Phenylamine
B. Ethylamine
C. Propylamine
D. Methylamine
The increase in the rate of reaction due to the increase in temperature is due to
A. Increased energy only
B. Successful collision only
C. Elastic collisions
D. Increased energy and successful collisions
Sodium carbonate is produced by
A. Haber process
B. Ammonia Solvay process
C. Decons process
D. Lead chamber process
Covalent network crystals have
A. Higher melting point then molecular crystals
B. Lower melting point then molecular crystals
C. Discrete molecules linked by Van der waals forces
D. Hydrogen bonding
What is a mixture of Potassium Nitrate Powdered Charcoal and Sulphur called?
A. Paint
B. Glass
C. Gun Powder
D. Cement