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