set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

Which is the symbol of the element tungsten?

a) W

b) Tc

c) Ta

d) V

Question : 3

1 u or 1 amu means

a) Mass of O-16 atom

b) Mass of C-12 atom

c) 1/12th mass of C-12 atoms

d) Mass of Hydrogen molecule

Question : 4

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

a) Proton-Neutron

b) Photon-Electron

c) Electron-Positron

d) Neutron-Neutrino

Question : 5

Which one among the following is correct regarding ²⁰Ne, ²³Na+, ¹⁹F– and ²⁴Mg²⁺?

a) They are isoelectronic with each other

b) They are isotopes of each other

c) They are isomers of each other

d) All of the above

Question : 6

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