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NAT II Biological Science Chemistry MCQs With Answers
Question # 1
In which of the following elements +1 oxidation state is more stable than +3
Choose an answer
B
Al
ga
Ti
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Question # 2
Carbon monoxide is pollutant as it
Choose an answer
Inactivates nerves
Inhibits glycolysis
Combines with oxygen
Combines with hemoglobin
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Question # 3
Water (H
2O
) is liquid while hydrogen sulphide (H
2
S) is a gas because
Choose an answer
Water has higher molecular weight
Hydrogen sulphide is a weak acid
Sulphure has high electronegativity than oxygen
Water molecules associate through hydrogen
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Question # 4
In public urinals, we observe some nascent smell. This smell is due to
Choose an answer
Hydrolysis of urea of urine by urease of atmosphere into NH
3
and CO
2
Formation of sulphonic acid by urea of urine
Reaction of CO
2
of atmosphere with urea mononitrate in urine
Hydregen present in air reacts with nitrogen forming NH
3
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Question # 5
Number of elements present in the fifth period of periodic table is
Choose an answer
8
10
18
32
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Question # 6
The total number of protons in 10 g of calcium carbonate is (N
0
= 6.023 x 10
23
)
Choose an answer
1.5057 x 10
24
2.0478 x 10
24
3.0115 x 10
24
4.0956 x 10
24
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Question # 7
The vapour density of a gas is 11.2. The volume occupied by 11.2 g of this gas at N.T.P. is
Choose an answer
22.4 litres
11.2 litres
1 litre
2.24 litres
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Question # 8
Which quantum number is sufficient to describe the electron is hydrogen
Choose an answer
ι
n
m
s
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Question # 9
The digestion of fats in the intestines is aided by
Choose an answer
Diffusion
Protection
Peptization
Emulsification
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Question # 10
The acid used in lead storage cells is
Choose an answer
Phosphoric acid
Nitric acid
Sulphuric acid
Hydrochloric acid
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Question # 11
Mild oxidation of glycerol with H
2
O
2
/FeSO
4 gives
Choose an answer
Glyceraldehyde
Dihydroxy acetone
Glycerose
None
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Question # 12
The essential component of organic compound is
Choose an answer
O
C
P
N
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Question # 13
When quantity of electricity passed is one faraday then the mass deposited at the electrode is equal to
Choose an answer
One gm. atomic weight
One gm. equivalent weight
Electrochemical equivalent
None of the above
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Question # 14
The IUPAC name of the compound having the formula (CH
3
)
3
C - CH = CH
2
is
Choose an answer
1, 1-Dimethyl-3-butene
1, 1, 1-Trimethyl-3-propene
3, 3,-Dimethyl-1-butene
3, 3, 3,-Trimethyl-1-propene
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Question # 15
If a salt bridge is removed electrode is made from which of the following?
Choose an answer
ZnCl
2
CuSO
4
Hg
2
Cl
2
HgCl
2
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Question # 16
Which one is not a pollutant normally?
Choose an answer
Hydrocarbons
Carbon dioxide
Carbon monoxide
Sulphur dioxide
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Question # 17
Which of these is the most widely used nitrogen fertilizer in Pakistan
Choose an answer
Urea
Ammonium nitrate
Ammonium Sulphate
Ammonium chloride
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Question # 18
The mass of the neutron is of the order of
Choose an answer
10
-23
kg
10
-24
kg
10
-26
kg
10
-27
kg
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Question # 19
In crystal structure of sodium chloride, the arrangement of CI
-
ions is
Choose an answer
Fcc
Both Fcc and bcc
Bcc
None of these
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Question # 20
Given below are some statements concerning formic acid, which of them is true?
Choose an answer
It is a weaker acid than acetic
it is a reducing agent
When its calcium salt is heated, it forms a ketone
It is an oxidizing agent
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