A. electrons
B. positrons
C. neutrons
D. mesons
✅ The correct answer is option D.
Chemistry MCQs
42. The molecular formula of phosphorous is
A. P1
B. P2
C. P3
D. P4
✅ The correct answer is option D.
43. The metal that is used as a catalyst in the hydrogenation of oils is
A. Ni
B. Pb
C. Cu
D. Pt
✅ The correct answer is option A.
44. The ionic radii of N3-, O2-, F- and Na+ follows the order
A. N3- > O2- > F- > Na+
B. N3- > Na+ > O2- > F-
C. Na+ > O2- > N3- > F-
D. O2- > F- > Na+ > N3-
✅ The correct answer is option A.
45. The method that cannot be used for removing permanent hardness of water is
A. adding sodium carbonate
B. distillation
C. adding caustic soda
D. boiling
✅ The correct answer is option D.
46. The maximum number of covalent formed by nitrogen is
A. 1
B. 2
C. 3
D. 4
✅ The correct answer is option D.
47. The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is
A. Dalton’s law
B. Gay Lussac’s law
C. Henry’s law
D. Raoult’s law
✅ The correct answer is option C.
48. The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in
A. 1.8 gram of H2O
B. 12 moles of KMnO4
C. 0.6N H2SO4
D. 4.6 gram of C2H5OH
✅ The correct answer is option B.
49. The most electropositive elements among the following is
A. Na
B. Ca
C. K
D. Cs
✅ The correct answer is option D.
50. The gas present in the stratosphere which filters out some of the sun’s ultraviolet light and provides an effective shield against radiation damage to living things is
A. helium
B. ozone
C. oxygen
D. methane
✅ The correct answer is option B.