Chemistry Class 9th

121- Molecule made up of one atom is called

A) Mono atomic

B) Tri-atomic

C) Poly atomic

122- Example of mono atomic molecule is

A) H2

B) O3

C) Ar

123- Molecule made up of two atoms is called

A. Mono atomic

B) Bi-atomic

C) Poly atomic

124- Molecule made up of three atoms is called

a) Mono atomic

B) Tri-atomic

C) Poly atomic

125-Molecule made up of many atoms is called

a) Mono atomic

B) Triatomic

C) Poly atomic

126- Example of biatomic molecule is

a) H2

B) Ar

C) CH4

127- Example of triatomic molecule is

A. O3

B) H2O

C) Both of these

128- Example of poly atomic molecule is

a) NH3

B) CO2

C) He

129- Large molecules are called

A. Micro molecules

B) Macro molecules

C) Simple molecules

130- Small molecules are called

A) Micro molecules

B) Macro molecules

C) Simple molecules

131-On the basis of nature of atoms molecules are classfied into --------groups

A. Three

B) Two

C) Four

132- A Molecule containing same type of atoms, is called

A. Homoatomic molecule

B) Heteroatomic

C) Neutral

133- A molecule consists of different kinds of atoms, it is called

A) Heteroatomic molecule

B) Homoatomic

C) Neutral

134-The example of homoatomic molecule is

A. H2

B) CO2

C) HCl

135- The example of heteroatomic molecule is

A) H2O

B) N2

C) O 2

136- The number of particles in one mole of substance is called

A) Plank’s constant

B) Avogadro’s number

C) None of these

137- Avogador’s no. is represented by symbo1

A. N

B) n

C) NA

138- The value of NA is equal to ---------

A. 6.023 × 1034

B) 6.023 × 1013

C) 6.023 × 1023

139- 1g of hydrogen is equal to

A. 1 mole of hydrogen

B) 6.023 × 1023 atoms of hydrogen

C) Both a and b

140- ---------- unit is used to measure the amount of substance

A. Gram

B) Avogadro’s number

C) Mole