SAT Chemistry - Air
Exam Duration: 45 Mins Total Questions : 30
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 of atmosphere nearest to earth surface is
- (a)
Troposphere
- (b)
Stratosphere
- (c)
Ozone layer
- (d)
Ionosphere
The layer which reflects radio signals back to earth is
- (a)
Ozone layer
- (b)
Troposphere
- (c)
Ionosphere
- (d)
Stratosphere
At sea level, atmospheric pressure is equal to the weight of a mass acting on every square centimeter
- (a)
1 gm
- (b)
10 kg
- (c)
1 kg
- (d)
10 gm
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
Atmospheric pressure ______ as the attitude ________
- (a)
Increases, increases
- (b)
Decreases, decreases
- (c)
Decreases, increases
- (d)
Remain same
Lime water turns milky when exposed to atmosphere air. This shows thatair contains
- (a)
CO2
- (b)
O2
- (c)
N2
- (d)
H2
The instrument used to measure atmospheric pressure
- (a)
Electrometer
- (b)
Thermometer
- (c)
Barometer
- (d)
Magnameter
When air is cooled, CO2 separates as dry ice at
- (a)
-78°C
- (b)
78°C
- (c)
0°C
- (d)
-8°C
The metal which reacts with oxygen at room temperature
- (a)
Pt
- (b)
Fe
- (c)
Zn
- (d)
Na
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
The process which is impossible without oxygen is
- (a)
Respiration
- (b)
Combustion
- (c)
Oxidation
- (d)
All of these
In the preparation of oxygen \(2KCIO_3\xrightarrow[250^0]{Δ}2KCl + 3O_2\) the catalyst used is
- (a)
KCl
- (b)
KClO3
- (c)
MnO2
- (d)
None
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
Atmospheric N2 fixation takes place in presence of
- (a)
Rainfall
- (b)
Windstorm
- (c)
Lightning
- (d)
Snowfall
Depletion of ozone layer takes place due to
- (a)
Methyl alcohol
- (b)
Carbon tetrachloride
- (c)
Benzene
- (d)
Chlorofluorocarbon
Carbon cycle ensures a constant ________ in atmosphere.
- (a)
Percentage of CO2
- (b)
Pressure of CO
- (c)
Pressure of CO2
- (d)
Percentage of CO
Carbogen contains
- (a)
95% CO2,5% O2
- (b)
5% CO2,95% O2
- (c)
5% N2,95% O2
- (d)
5% CO2,95% N2
Which of the following effects nervous system:
- (a)
Oxides of N2
- (b)
CO
- (c)
Compound of lead
- (d)
CO2
All plant need nitrogen to make
- (a)
Protein
- (b)
Carbohydrates
- (c)
Fats
- (d)
Minerals
Solid ____ is called dry ice
- (a)
O2
- (b)
CO2
- (c)
N2
- (d)
H2O
Ozone is present in
- (a)
Troposphere
- (b)
Stratosphere
- (c)
Misosphere
- (d)
Ionosphere
______ is the chief source for producing nitrogenous fertilizers
- (a)
O2
- (b)
H2O
- (c)
NH3
- (d)
O3
Oxygen on liquification changes to
- (a)
Blue liquid
- (b)
Green liquid
- (c)
Red liquid
- (d)
None of these
The atmospheric pressure at sea level is:
- (a)
76 mm height of Hg
- (b)
76 cm height of Hg
- (c)
7.6 cm height of Hg
- (d)
760 cm height of Hg.
_______ gas is used to fill electric bulb at low pressure:
- (a)
O2
- (b)
H2
- (c)
Ar
- (d)
N2
______ is used for growing vegetable in snow bound region
- (a)
Light
- (b)
Green house effect
- (c)
Acid rain
- (d)
Fertilizer
