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Chemistry General Science Test Hard Mode MCQs With Answers
Question # 1
Which of the following pairs are chemically dissimilar?
Choose an answer
Na and K
Ba and Sr
Zr and Hf
Ca and Zn
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Question # 2
The molal elevation constant is the ratio of the elevation in boiling point to
Choose an answer
Molarity
Molality
Mole fraction of solute
Mole fraction of solvent
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Question # 3
In N.W.F.P the phosphate fertilizer are produced at
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D.I.Khan
Haripur
Nowshera
Dargai
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Question # 4
Setting of cement is an
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Exothermic reaction
Endothermic reaction
Neither exothermic nor endothermic
None
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Question # 5
The reaction/method that does not give an alkane is
Choose an answer
Catalytic hydrogenation of alkanes
Wurtz reaction
Hydrolysis of alkyl magnesium bromide
Dehydrohalogenation of an alkyl halid.
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Question # 6
The treatment of benzene with isobutene in the presence of sulphuric acid give
Choose an answer
Isobutyl benzene
Tert-Butyl benzene
n-Butyl benzene
no reaction
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Question # 7
The number of atoms contained in 11.2 L of SO
2
at S.T.P are
Choose an answer
3/2 x 6.02 x 10
23
2 x 6.02 x 10
23
6.02 x 10
23
4 x 6.02 x 10
23
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Question # 8
Which is the most volatile compound?
Choose an answer
HI
HCI
HBr
HF
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Question # 9
Hybridization explain the------- of orbitals
Choose an answer
Type of Bonding
Shapes
Shape and Type of bonding
None of above
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Question # 10
The order of reactivity of halogens in aliphatic substitution reactions is
Choose an answer
Br2 > CI2 > F2
CI2 > Br2 > F2
CI2 CI2 > Br2
F2 > Br2 > CI2
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Question # 11
Which of the following species participate in sulphonation of benzene ring?
Choose an answer
H
2
SO
4
HSO
-
3
SO
3
SO
-
2
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Question # 12
The weight of 11.2 litres of CO
2
at S.T.P. would be
Choose an answer
88 g
44 g
32 g
22 g
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Question # 13
The substance used as a smoke screen in warfare is
Choose an answer
SiCl
4
PH
3
PCl
5
Acetylene
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Question # 14
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 # 15
The freezing point of 1 molal NaCl solution assuming NaCl to be 100% dissociated in water in
Choose an answer
-1.86
°C
-3.72
°C
+1.86
°C
+3.72
°C
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Question # 16
Bond angle is minimum for
Choose an answer
H
2
O
H
2
S
H
2
Se
H
2
Te
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Question # 17
Tollen's reagent is
Choose an answer
Ammonical cuprous chloride
Ammonical cuprous oxide
Ammonical silver bromide
Ammonical silver nitrate
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Question # 18
Ionic solids with defects, contain
Choose an answer
Equal number of cation and anion vacancies
Interstitial anions and anion vacancies
Cation vacancies only
Cation vacancies and interstitial cations
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Question # 19
Variable valency is generally exhibited by
Choose an answer
Normal elements
Transition elements
Metallic elements
None of these.
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Question # 20
Which of the following is a colligative property?
Choose an answer
Melting point
Osmotic pressure
Freezing point
Sublimation temperature
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Question # 21
When KClO
3
is heated, it decomposes into KCl and O
2. If some MnO2 is added, the reaction goes much faster because
Choose an answer
MnO
2
decomposes to give O
2
MnO
2
provide heat by reacting
Better contact is provided by MnO
2
MnO
2
acts as a catalyst.
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Question # 22
Alum is not used
Choose an answer
As a mordant in dyeing
As an insecticide
In purification of water
In tanning of leather
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