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Quiz 6
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Q.1
When iron rusts, its weight
Decreases
Increases
Remains the same
First increases and then decreases
Q.2
Air is said to be saturated when :
It contains maximum content of water vapour
Its pressure is minimum
Its thickness is maximum
It blows over the barren land
Q.3
For extinguishing fire, we use
Hydrogen
Carbon Monoxide
Carbon Dioxide
Marsh gas
Q.4
What are the number of moles of CO
2
which contains 16 g of oxygen?
0.5 mole
0.2 mole
0.4 mole
0.25 mole
Q.5
The octane number of zero is assigned to
2-methyl octane
n-heptane
iso-octane
3-methyl octane
Q.6
The metal that is used as a catalyst in the hydrogenation of oils is
Ni
Pb
Cu
Pt
Q.7
The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth's early life and solidified into hard rock's called
granite
basalt
igneous rocks
sedimentary rocks
Q.8
The most electronegative element among the following is
sodium
bromine
fluorine
oxygen
Q.9
Highest percentage of carbon is found in which form of coal?
Anthracite
Bituminous
Peat
Lignite
Q.10
Spirit in contact with body gives cool sensation because it is :
Liquid
Transparent
Highly volatile
A good conductor
Q.11
Diamond is lustrous because
It is colourless
It is hard
It is pure
Its refractive index is high
Q.12
The lightest gas which is non-inflammable is
Hydrogen
Helium
Oxygen
Nitrogen
Q.13
Carbon monoxide is an inflammable gas. Which one of the following is also inflammable?
Helium
Nitrogen
Oxygen
Hydrogen
Q.14
Ozone layer of atmosphere absorbs:
Ultraviolet rays
Infra-red rays
All radiations of Light
Cosmic rays.
Q.15
The gas used to extinguish fire is
Neon
Nitrogen
Carbon dioxide
Carbon monoxide
Q.16
The metal that is usually extracted from sea water is
Ca
Na
K
Mg
Q.17
The National Chemical Laboratory is situated in
New Delhi
Bangalore
Pune
Patna
Q.18
Dry powder fire extinguishers contain
Sand
Sand and sodium carbonate
Sand and potassium carbonate
Sand and sodium bicarbonate
Q.19
The most abundant rare gas in the atmosphere is
He
Ne
Ar
Xe
Q.20
The nucleus of a hydrogen atom consists of
1 proton only
1 proton + 2 neutron
1 neutron only
1 electron only
Q.21
A metal is exposed to the atmosphere for sometime. It becomes coated with green carbonate. The metal must be
Silver
Copper
Aluminium
Zinc
Q.22
The most abundant inert gas in the atmosphere is
Helium
Neon
Argon
Krypton
Q.23
The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is
Dalton's law
Gay Lussac's law
Henry's law
Raoult's law
Q.24
The metal used to recover copper from a solution of copper sulphate is
Na
Ag
Hg
Fe
Q.25
The main source of carbon monoxide is
Industrial process
Fuel combustion
Transportation
Solid waste disposal
Q.26
The biogas used for cooking is a mixture of which of the following?
Carbon dioxide and oxygen
Isobutane and propane
Methane and carbon monoxide
Methane and carbon dioxide
Q.27
Dry ice is
Solid ammonia
Solid sulphur dioxide
Dry carbon dioxide gas
Solid carbon dioxide
Q.28
Preparation of ‘Dalda or Vanaspati’ ghee from vegetable oil utilizes the following process :
Hydrolysis
Oxidation
Hydrogenation
Ozonolysis
Q.29
When Hydrogen starts burning in air, it produces ?
Ammonia
Water
Methane
Carbonic Acid
Q.30
Air shows the property of
N
2
O
2
Both A and B
None of these
Q.31
Which of the following could be used as fuel in propellant or rockets ?
Liquid Hydrogen + Liquid Nitrogen
Liquid Oxygen + Liquid Argon
Liquid Nitrogen + Liquid Oxygen
Liquid Hydrogen + Liquid Oxygen
Q.32
Which among the following coal contains 90 per cent of carbon?
Anthracite
Bitumen
Lignite
Peat
Q.33
Major portion of the earth’s crust is mainly constituted by
Oxygen and Iron
Oxygen and Silicon
Silicon and Iron
Silicon and Aluminium
Q.34
The method of concentrating the ore which makes use of the difference in density between ore and impurities is called
liquation
leaching
levigation
magnetic separation
Q.35
The inert gases are ____ in water.
sparingly soluble
insoluble
soluble
None of these
Q.36
Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be
2 : 16 : 2
2 : 16 : 1
1 : 16 : 2
1 : 1 : 1
Q.37
Dry ice is the solid form of :
Air
Carbon dioxide
Nitrogen
Water
Q.38
The heat required to raise the temperature of body by 1 K is called
specific heat
thermal capacity
water equivalent
None of the above
Q.39
The major constituent of gobar gas is
Carbon dioxide
Methane
Butane
Isobutane
Q.40
The material used in the manufacture of lead pencil is
Graphite
Lead
Carbon
Mica
Q.41
Which one among the following is not a mixture?
Graphite
Glass
Brass
Steel
Q.42
Litmus is obtained from
A bacterium
A fungus
An alga
Lichen
Q.43
Which among the following is pure matter ?
Carbon dioxide
Brass
Air
Iron
Q.44
Colour imparted to the Bunsen flame by strontium salt is
Bluish green
Apple-green
Brick red
Crimson red
Q.45
Which of the following is not a noble gas ?
Hydrogen
Helium
Neon
Argon
Q.46
The gas which turns into liquid at the lowest temperature among the following is
Hydrogen
Oxygen
Helium
Nitrogen
Q.47
The most abundant constituent of atmospheric air is :
Carbon
Hydrogen
Oxygen
Nitrogen
Q.48
Which gas is used for converting vegetable oils into saturated fats ?
H
2
O
2
C
l2
SO
2
Q.49
In surgery, metal pins are used for joining together broken bones. These metal pins remain uncorroded in the body. What is the material of these pins?
Copper
Iron
Aluminium
Titanium
Q.50
The molecular formula of phosphorous is
P
1
P
2
P
3
P
4
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