NTSE SAT Chemistry - Air
Exam Duration: 45 Mins Total Questions : 30
78% of air by volume is
- (a)
Nitrogen
- (b)
Carbon dioxide
- (c)
Oxygen
- (d)
Ozone
Dentrifying bacteria
- (a)
Converts atmospheric N2 into nitrates.
- (b)
Remove nitrogen from the soil
- (c)
Converts nitrate of soil back into atmospheric nitrogen
- (d)
Have nothing to do with N2 cycle.
The layer which reflects radio signals back to earth is
- (a)
Ozone layer
- (b)
Troposphere
- (c)
Ionosphere
- (d)
Stratosphere
Aneroid barometer means:
- (a)
Without liquid
- (b)
Without solid
- (c)
Without gas
- (d)
Without liquid and gas
0.03% of air consist of
- (a)
Ar
- (b)
N2
- (c)
O2
- (d)
CO2
Barometer is a thin glass tube containing:
- (a)
Mercury
- (b)
Lead
- (c)
Tin
- (d)
Tungsten
The layer of atmosphere which is cold, thin without cloud and dust is
- (a)
Troposphere
- (b)
Ozone layer
- (c)
Stratosphere
- (d)
Ionosphere
About ______ of air contain oxygen
- (a)
2/3rd
- (b)
1/5th
- (c)
2/5th
- (d)
1/4th
Boiling point of nitrogen is
- (a)
-78°C
- (b)
-196°C
- (c)
0°C
- (d)
-183°C
Air can be separated into its constituent gases by:
- (a)
Distillation
- (b)
Fractional distillation
- (c)
Sublimation
- (d)
None of these
Inthe preparation of oxygen: KMnO4 \(\xrightarrow{Δ}\) X + Y + Z, X, Y, Z represents:
- (a)
KMnO4' MnO4' O2
- (b)
K2MnO4' MnO4' O2
- (c)
K2MnO4' K2O' O2
- (d)
None of these
Plants use nitrogen in the form of:
- (a)
N2
- (b)
Nitrates
- (c)
NO2
- (d)
NO3
Oxygen reacts with non-metal to form
- (a)
Acidic oxide
- (b)
Basic oxide
- (c)
Amphoteric oxide
- (d)
None
The process which is impossible without oxygen is
- (a)
Respiration
- (b)
Combustion
- (c)
Oxidation
- (d)
All of these
Oxygen reacts with metal to form
- (a)
Acidic oxide
- (b)
Basic oxide or amphoteric oxide
- (c)
Amphoteric oxide
- (d)
Neutral oxide
O2 is collected by:
- (a)
Downward displacement of air
- (b)
Upward displacement of H2O
- (c)
Downward displacement of H2O
- (d)
None of these
The process of converting free atmospheric N2 into compounds of nitrogen i.e. nitrates is called:
- (a)
Nitrogen cycle
- (b)
N2-fixatio
- (c)
Haber process
- (d)
None of these
Rhizobium bacteria, which converts atmospheric N2 into compounds of N2 is present in the root nodules of plants belonging to
- (a)
Onion family
- (b)
Grass family
- (c)
Leguminous family
- (d)
None of these
Atmospheric N2 fixation takes place in presence of
- (a)
Rainfall
- (b)
Windstorm
- (c)
Lightning
- (d)
Snowfall
Rain water containing _____ is called acid rain
- (a)
H2SO4
- (b)
HNO3
- (c)
HCI
- (d)
Both a and b
Carbogen contains
- (a)
95% CO2,5% O2
- (b)
5% CO2,95% O2
- (c)
5% N2,95% O2
- (d)
5% CO2,95% N2
When ________ is inhale carboxyhaemoglobin is formed:
- (a)
O2
- (b)
CO
- (c)
N2
- (d)
CO2
All plant need nitrogen to make
- (a)
Protein
- (b)
Carbohydrates
- (c)
Fats
- (d)
Minerals
__________ is used as fuel in rockets.
- (a)
Liquid H2
- (b)
Liquid N2
- (c)
O2
- (d)
Liquid O2
Solid ____ is called dry ice
- (a)
O2
- (b)
CO2
- (c)
N2
- (d)
H2O
_______ makes the burning of petrol more efficient but unhealthy
- (a)
Compounds of lead
- (b)
Compounds of iron
- (c)
Compounds of tin
- (d)
Compounds of zinc
Air pollution can be controlled by
- (a)
Reducing the use of fossil fuel
- (b)
By filtering out the solid particles from smoke
- (c)
Using unleaded petrol
- (d)
By all of these
When one sucks through a straw, the pressure inside becomes ____ than the atmospheric pressure on the surface of liquid
- (a)
More
- (b)
Less
- (c)
Equal to
- (d)
None
_______ gas is used to fill electric bulb at low pressure:
- (a)
O2
- (b)
H2
- (c)
Ar
- (d)
N2
The noble gas used in treatment of cancer is:
- (a)
Radon
- (b)
Argon
- (c)
Neon
- (d)
Helium
