General Chemistry

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121 Formation of ozone hole is maximum over

A
Africa
B
India
C
Antarctica
D
Europe

122 Which of the following alkali metals has highest specific heat?

A
Caesium
B
Rubidium
C
Potassium
D
Lithium

123 Which amidst the following is not a gem stone ?

A
Cat’s-eye
B
Topaz
C
Opal
D
Pearl

124 Which one of the following is used as a sowing agent in the preparation of soft drinks?

A
Phosphoric acid
B
Phosphorus acid
C
Salicylic acid
D
Boric acid

125 Which of the following is not present in German-silver?

A
Copper
B
Nickel
C
Silver
D
Zinc

126 The polymerisation of which of the following is used in manufacturing of polythene in industry ?

A
Methane
B
Styrene
C
Acetylene
D
Ethylene

127 Sea water can be purified by the process of :

A
distillation
B
evaporation
C
filtration
D
fractional distillation

128 Radioactive disintegration of uranium ultimately results in formation of :

A
radium
B
thorium
C
polonium
D
lead

129 Cloud is a colloidal dispersion of :

A
Air in a dispersion medium of water
B
Fog in a dispersion medium of water
C
Mist in a dispersion medium of air
D
Water drops in a dispersion medium of air

130 Tear gas is :

A
Chloroprene
B
Carbonyl chloride
C
Nitrous oxide
D
Bleaching powder

131 When conc. H2 SO4 is added to dry KNO3 , brown fumes are evolved. These fumes are due to :

A
SO3
B
SO2
C
NO2
D
N2O

132 ‘Milk Sugar’ is :

A
Lactose
B
Maltose
C
Galactose
D
Sucrose

133 Which one of the following organic compounds has fruity smell?

A
Alcohol
B
Aldehyde
C
Ester
D
Ether

134 Heat resistant variety of glass is:

A
Pyrex glass
B
Hard glass
C
Flint glass
D
None of these

135 Aluminium can be purified by which of the following:

A
oxidation
B
distillation
C
electrolysis
D
ozonolysis