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Chemistry MCQ Question - Environmental Chemistry
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Chemistry MCQ Question - Environmental Chemistry
1
Hypochlorous acid is used for disinfecting the water it reacts with the dissolved ammonia producing
A
NH2Cl
B
NHCI2
C
NCI2
D
all of the above
2
Acid present in acid rain may be
A
H2SO4
B
HNO3
C
both a and b
D
none
3
The yellow colour in photochemical smog is due to presence of
A
dinitrogen oxide
B
nitrogen dioxide
C
chlorine gas
D
chlorine dioxide
4
Which of the following is not a condition for the formation of smog?
A
sufficient NO
B
sunlight
C
less movement of air
D
winds
5
Incineration of muncipal waste is carried out in the temperature range of
A
250 to 500?C
B
500 to 900?C
C
950 to 1300?C
D
900 to 1000?C
6
In which of the following layer of atmosphere there is more thickness of ozone layer?
A
troposphere
B
stratosphere
C
mesosphere
D
photosphere
7
Which of the following is not primary pollutant
A
SO3
B
CO
C
NO
D
H2SO4
8
Which of the following air pollutants is more dangerous for ozone layer?
A
CFC
B
CO2
C
CO
D
Oxides of nitrogen
9
Which of the following gases is the main cause of acid rain?
A
CO
B
NO2
C
both a & b
D
none of the above
10
Which statement is wrong?
A
the amount of ozone layer is greater in the region close to the equator
B
ozone acts as filter for UV radiations
C
in the equatorial region it acts as pollutant
D
CFCs play effective role in removing O3 in the stratosphere
11
Which of the following factors help to measure quallity of water?
A
DO
B
BOD
C
COD
D
all of the above
12
In the purification of portable water the coagulant used is
A
alum
B
nickel sulphate
C
copper sulphate
D
barium sulphate
13
Newspaper can be recycled again and again how many times?
A
2
B
3
C
4
D
5
14
The main pollutant of leather tanneries in the waste water is
A
chromium III
B
chromium IV
C
chromium V
D
chromium VI
15
A single chlorine free radical can destroy how many ozone molecules?
A
10
B
100
C
10000
D
100000
16
Which substance can be used for disinfecting water?
A
KMnO4
B
Alums
C
Ozone
D
All
17
Chlorination of water may be harmful if the water contains
A
Ammonia
B
Dissolved oxygen
C
Carbon dixide
D
All
18
Which one of the following makes the bulk of hydrospheres content?
A
oceans
B
glaciers & icecaps
C
fresh water lakes and ponds
D
All have equal distribution
19
Which of the following is used as water disinfectant to avoid the formation of toxic compounds
A
Cl2
B
O3
C
ClO2
D
both b & c
20
The percentage of suspended solid waste in raw water is removed by coagulation is
A
60
B
70
C
80
D
90
21
Ozone hole is substantial depletion of ozone in every year during
A
Aug - Nov
B
Sep - Nov
C
Nov - Dec
D
Dec - Jan
22
The main product of bacterial action is
A
Nox
B
NO2
C
N2O3
D
NO
23
Pollutants have adverse effect over
A
Biosphere
B
Ecosystem
C
Both a & b
D
Hydrosphere
24
Diameter of an atom is in the order of
A
0.2m
B
0.2mm
C
0.2nm
D
0.2pm
25
Which of the following are isoelectronic species?
A
H+ H H-
B
Li+ Na+ K+
C
C1- Br- I
D
F- Ne Na+
26
Mass spectrometer is used to determine Mass number of isotopes and
A
Atomic number
B
Relative abundance
C
Electronic configuration
D
All of the above
27
Molecular ions are formed by passing
A
High energy electron beam
B
? - particle
C
X-rays
D
All of the above
28
The number of peaks obtained in mass spectrometry shows
A
Relative abundance
B
Average mass of element
C
Number of isotopes
D
Relative isotopic mass
29
Empirical formula of chloroform is
A
CH2 C12
B
CH3C1
C
CC14
D
CHC13
30
Which one is true about isotope?
A
Same number of neutrons
B
Same mass number
C
Same physical properties
D
Same chemical properties
31
Molecular mass of water (18g) means
A
1-mole molecules of water
B
1-gram molecule of water
C
3-gram atoms
D
all
32
Which of the following ion formation is always exothermic?
A
Uni-negative
B
Uni-positive
C
Di-negative
D
Di-positive
33
Which of the following statements about isotopes is correct?
A
Isotopes with odd atomic number are abundant
B
Isotopes with odd atomic number and even mass number are abundant
C
Isotopes with even atomic number and even mass number are abundant
D
Isotopes with even atomic number and odd mass no are abundant
34
The sample of isotopes of an element which needs not to be vaporized in the vaporization chamer
A
Gas
B
Liquid
C
Volatile solid
D
All
35
One mole of CO2 contains.
A
6.022 x 1023 atoms of oxygen
B
22-gram electrons
C
6.022 x 1023 atms of carbon
D
both b & c
36
Avogadros number may represent
A
volume of particles
B
number of particles
C
mass of particles
D
All of the above
37
The number of isotopes of elements with even mass number and even atomic number are.
A
280
B
300
C
154
D
54
38
Size of molecule depends upon
A
Atomicity
B
Shape of molecule
C
Both a and b
D
Difficult to predict
39
Which of the following terms is not used for ionic compound?
A
formula unit
B
empirical formula
C
molecular formula
D
formula mass
40
0.36 moles of each aluminium and oxygen react with each other to produce aluminium oxide. The amount of product formed is
A
0.18 mole
B
0.27 mole
C
0.24 mole
D
0.09 mole
41
Which of the following terms is used for the mass of chlorine 35.5?
A
relative atomic mass
B
mass number
C
atomic weight
D
relative isotopic mass
42
Which one of the following has the maximum number of isotopes?
A
oxygen
B
carbon
C
tin
D
chlorine
43
Which one of the following is not the mono isotopic element?
A
arsenic
B
uranium
C
iodine
D
nickel
44
The volume occupied by 2.8 g of N2 at STP
A
2.24 dm3
B
22.4 dm3
C
1.12 dm3
D
112 dm3
45
The mass of decimole of electrons (NA) is
A
1.008 mg
B
0.184 mg
C
0.054 mg
D
5.4 mg
46
The number of moles of CO2 which contains 16 g of oxygen is
A
0.25
B
0.5
C
0.75
D
1
47
Which of the following statements is wrong about isotopes?
A
they possess different mass number
B
they possess different physical properties
C
they possess same chemical properties
D
they possess different position in the periodic table
48
How many isotopes have odd atomic number?
A
154
B
280
C
86
D
300
49
Qualitative analysis is carried out for
A
identification of elements
B
estimation of amounts of elements
C
molar ration of elements
D
molar volume of elements
50
Percentage of calcium in calcium carbonate is
A
80%
B
30%
C
40%
D
20%
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