set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Which one of the following pairs constitutes particle-antiparticle pair?

a) Proton-Neutron

b) Photon-Electron

c) Electron-Positron

d) Neutron-Neutrino

Question : 2

Age of fossil may be found out by determining the ratio of two isotopes of carbon. The isotopes are

a) C-12 and C-14

b) C-13 and C-14

c) C-12 and C-13

d) C-12 and carbon black

Question : 3

When an atom loses electrons, it is called a (an) _____ and has a ______ charge.

a) cation, positive

b) anion, negative

c) anion, positive

d) cation, positive

Question : 4

Which one among the following transitions of electron of hydrogen atom emits radiation of the shortest wavelength?

a) n = 4 to n = 3

b) n = 3 to n = 2

c) n = 2 to n = 1

d) n = 5 to n = 4

Question : 5

What is the number of mole(s) of H₂ (g) required to saturate one-mole benzene?

a) 3

b) 2

c) 1

d) 4

Question : 6

Regarding the atom of a chemical element, the magnetic quantum number refers to

a) Shape

b) Size

c) Orientation

d) Spin