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Chemistry General Science Test Hard Mode MCQs With Answers
Question # 1
The most reactive compound for electrophilic nitration will be
Choose an answer
Benzyl chloride
Benzoic acid
Nitrobenzene
Chlorobenzene
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Question # 2
The percentage of nitrogen in urea is
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46
60
70
80
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Question # 3
Which species represents the electrophile in aromatic nitrotaion?
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NO
-
2
+
NO
2
NO2
NO
-
3
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Question # 4
Hess's law deals with
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Changes in heat or reaction
Rate of reaction
Equilibrium constant
Influence of pressure on volume of a gas
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Question # 5
A clathrate may be defined as a
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Cage compound
Liquid crystal
Mixture
Solid solution
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Question # 6
Which of the following transition metal ions will have definite value of magnetic moment?
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Sc
3+
Ti
3+
Cu
+
Zn
2+
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Question # 7
The rotation of two carbon atoms joined by double bond would happened only if
Choose an answer
Pi bond is broken
Sigma bond is broken
Both bonds are broken
None of above
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Question # 8
The freezing point of 1 molal NaCI solution assuming NaCI 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 # 9
Carbon atom holding halogen in aryl halides is
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Sp
2
-hybridesed
Sp
3
-hybridesed
Sp
-hybridesed
Sp
3
d -hybridesed
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Question # 10
Covalent compounds are soluble in
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Polar solvents
Non-polar solvents
Concentrated acids
All solvents
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Question # 11
When pressure is applied to the equilibrium system Ice Water Which of the following phenomenon will happen?
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More ice will be formed
Water will evaporate
More water will be formed
Equilibrium will not be formed
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Question # 12
Water (H
2O
) is liquid while hydrogen sulphide (H
2
S) is a gas because
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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 # 13
Octane number can be changed by
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Isomerisation
alkylation
Cyclisation
All of these
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Question # 14
The halide which is not hydrolysed is
Choose an answer
SiCl
4
SiF
4
CCl
4
PbCl
4
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Question # 15
Formic acid is obtained when
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Calcium acetate is heated with conc. H
2
SO
4
Calcium formate is heated with calcium acetate
Glycerol is heated with oxalic acid
Acetaldehyde is oxidized with K2Cr
2
O
7
and H
2
SO
4
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Question # 16
White P when boiled with strong solution of caustic soda produces
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Phosphine
Posh acid
Phosphorous acid
None
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Question # 17
The number of oxygen atoms in 4.4 g of CO
2
is approximately
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1.2 x 10
23
6 x 10
22
6 x 10
23
12 x 10
23
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Question # 18
The osmotic pressure of solution increases if
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Temperature is decreased
Solution constant is increased
Number of solute molecules are increased
Volume is increased
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Question # 19
Red P can be obtained from white P by
Choose an answer
Heating it with a catalyst in an inert atmosphere
Distilling it in an inert atmosphere
Dissolving it in CS
2
and crystallzing
Melting it and pouring the liquid into water
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Question # 20
The reagent which forms crystalline osazone derivation when treated with glucose is
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Fehling solution
Phenyl hydrazine
Benedict solution
Hydroxyl amine
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Question # 21
The formula of nitre is
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KNO
3
NANO
2
NaCl
Na
2
CO
3
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Question # 22
According to MO theory, the species O
+
2
Choose an answer
Bond order of 2.5
Three unpaired electrons
Diamagnetic character
Stability lower then O
2
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