set 4 MCQ Questions & Answers Detailed Explanation

Question : 1

The elements of a group in the periodic tabic

a) have consecutive atomic numbers

b) are isobars

c) have similar chemical properties

d) are isotopes

Question : 2

Which one of the following elements exhibit maximum number of valence electrons?

a) Al

b) Si

c) Na

d) P

Question : 3

Process of solid camphor into camphor vapour is called

a) Freezing

b) Melting

c) Vaporisation

d) Sublimation

Question : 4

Which of the following properties do not match elements of halogen family ?

a) They are diatomic in their molecular form

b) They are highly reactive chemically

c) They have seven electrons in their valence shell

d) They are metallic in nature

Question : 5

Which of the following statements are true about the quantum numbers n, l, m and s?

1. l gives an idea of the shape of the orbital
2. m gives the information of the energy of electron in a given orbital
3. n gives the idea of the size of the orbital
4. s gives the direction of spin of electron in an orbital

a) 1, 2 and 3

b) 1, 3 and 4

c) 2, 3 and 4

d) 1, 2 and 4

Question : 6

The element with smallest size in group 13 is

a) carbon

b) aluminium

c) beryllium

d) boron