Chemistry MCQS

111. The distillation under reduced pressure is called:
A) Fractional distillation
B) Vacuum distillation
C) Steam distillation
D) Pressure distillation

112. According to Graham’s Law of Diffusion, the rate of diffusion of H2 and O2 has the ratio:
A) 1:4
B) 1:√4
C) 4:1
D) 2:32

113. According to the Kinetic theory of gases, the molecular collisions are elastic. Such collisions cause:
A) No energy change
B) A small energy change
C) High energy change
D) None of these

114. The number of molecules of 4g H_2 are _ number of molecules of 56g of N_2.
A) Equal to
B) Less than
C) Greater than
D) None of these

115. The solution of which acid is used for seasoning of food?
A) Acetic acid
B) Formic acid
C) Benzoic acid
D) Botanic acid

116. Which of the following gases is commonly used in extinguishers?
A) CO2
B) SO2
C) O2
D) NO2

117. _ is an example of an amorphous solid.
A) Plastic
B) Diamond
C) Sodium Chloride
D) Glucose

118. Identify the molecule with a double covalent bond?
A) O2
B) H2
C) N2
D) C2H2

119. Alkali metals belong to?
A) 1st group
B) 2nd group
C) 3rd group
D) 4th group

120. Modern periodic table consists of?
A) Two Blocks
B) Three Blocks
C) Four Blocks
D) Five Blocks