Top 1000+ Solved Chemistry MCQ Questions Answer
Q. Heavy water is so called because it contains -
a. Heavy isotope of hydrogen
b. Heavy isotope of oxygen
c. Mole number of hydrogen atoms
d. Mole number of oxygen atoms
Q. Heating of a ore below its melting point in the absence of air is known as –
a. Refining
b. Calcination
c. Roasting
d. Smelting
Q. The most electronegative element among the following is –
a. Fluorine
b. Sodium
c. Chlorine
d. Oxygen
Q. The quality of petrol is expressed in terms of –
a. Cetane number
b. Gold number
c. Octane number
d. Added unlead compounds
Q. Energy is continuously generated in the sun due to .
a. Nuclear fusion
b. Nuclear fission
c. Radioactivity
d. Artificial radioactivity
Q. The apparatus used to test acidity of aqueous solution is -
a. pH meter
b. Ammeter
c. Hygrometer
d. Acidmeter
Q. Which one of the following elements is an example of noble gas?
a. Nitrogen
b. Hydrogen
c. Chlorine
d. Helium
Q. Which of the following elements does not exhibit natural radioactivity?
a. Uranium
b. Thorium
c. Aluminium
d. Polonium
Q. Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere?
a. Chlorofluorocarbons
b. Nitrous oxide
c. Sulphur dioxide
d. Carbon dioxide
Q. The deterioration of a metal by an electrochemical process is commonly termed as –
a. Erosion
b. Corrosion
c. Passivation
d. Abrasion
Q. The source of energy that causes the least global warming is –
a. Coal
b. Geothermal energy
c. Natural Gas
d. Petroleum