Top 1000+ Solved Chemistry MCQ Questions Answer
Q. In electro-refining, the pure metal is deposited on –
a. vessel
b. electrolyte
c. cathode
d. anode
Q. Which among the following is used as a catalyst in the production of high octane fuels?
a. HNO3
b. H2SO4
c. HCl
d. HF
Q. Th effect or response produced by two or more chemicals are less than the sum of the effects or response that the chemical would produce individually is known as -
a. Antagonism
b. Independent
c. Additive
d. Synergism
Q. Which one out of the following helps in burning?
a. Oxygen
b. Carbon monoxide
c. Nitrogen
d. Carbon dioxide
Q. Which one of the following is a mixture of carbon monoxide and hydrogen?
a. coal gas
b. producer gas
c. water gas
d. gobar gas
Q. Which of the following elements has the lowest melting point?
a. Bromine
b. Zinc
c. Calcium
d. Lead
Q. The chemical substance present in bones and teeth is -
a. Calcium phosphate
b. Calcium chloride
c. Calcium sulphate
d. Calcium borate
Q. The compound that has the least value for octane number is –
a. 2-methyl heptane
b. Iso-octane
c. 2,2-dimethyl hexane
d. n-heptane
Q. Which of the following is a correct pair according to increasing atomic number from left to right?
a. Ca, Cl
b. Be, B
c. Na, Ne
d. He, H
Q. The gas causing acid rain in an industrial area is -
a. Carbon dioxide
b. Carbon monoxide
c. Sulphur dioxide
d. Methane
Q. Which one of the following has greatest mass?
a. electron
b. proton
c. neutron
d. hydrogen nucleus