set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

In which one of the following is the valence electronic configuration, ns²np³ found ?

a) Nitrogen

b) Oxygen

c) Carbon

d) Argon

Question : 2

The total number of atoms represented by the compound CuSO₄ .5H₂O is

a) 21

b) 5

c) 27

d) 8

Question : 3

Which of the following is not a basic particle of an element?

a) A molecule

b) An ion

c) An atom

d) None of these

Question : 4

The atoms, in which the number of protons is same but the number of neutrons is different, are known as

a) Isomers

b) Isotones

c) Isobars

d) Isotopes

Question : 5

In atom, neutron was discovered by

a) Chadwick

b) Rutherford

c) J.J. Thomson

d) Newton

Question : 6

The isotopes of an element have

a) same atomic number

b) same mass number

c) same number of neutrons

d) None of these