Top 1000+ Solved Chemistry MCQ Questions Answer
Q. When water itself combines chemically with some element or mineral it is called –
a. Carbonation
b. Desilication
c. Hydration
d. Oxidation
Q. The electronic configuration of an atom having atomic number `20' is –
a. 2, 8, 10
b. 2, 6, 8, 4
c. 2, 8, 8, 2
d. 2, 10, 8
Q. Which chemical is used to ripen mangoes artificially?
a. Sulphur Dioxide
b. Nitrous Oxide
c. Calcium Carbide
d. Phosphorous
Q. The luster of a metal is due to -
a. high polishing
b. high density
c. chemical inertness
d. presence of free electrons
Q. The depletion of Ozone layer is mainly due to –
a. Volcanic eruptions
b. Aviation fuels
c. Radioactive rays
d. Chlorofluorocarbons
Q. Acid rain is caused by -
a. SO2 and particulates
b. (2) NO2 and particulates
c. (8) CO2 and CFCs
d. (4) SO2 and NO2
Q. What happens in a reduction reaction?
a. addition of Oxygen
b. addition of Nitrogen
c. addition of Hydrogen
d. None of the above
Q. The energy released at the end of digestion is in the form of:
a. electric energy
b. Kinetic energy
c. thermal energy
d. chemical energy
Q. The gas used for artificial ripening of green fruit is -
a. Acetylene
b. Ethylene
c. Ethane
d. Carbon dioxide
Q. A mixture of water and alcohol can be separated by –
a. Filtration
b. Evaporation
c. Decantation
d. Distillation