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Chemistry General Science Test Hard Mode MCQs With Answers
Question # 1
Which of the following is a molecular disease?
Choose an answer
Allergy
Cancer
German measles
Sickle cell anemia
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Question # 2
Octane number can be changed by
Choose an answer
Isomerisation
Alkylation
Cyclisation
All of these
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Question # 3
Addition of iron filling to CuSO
4
solution caused precipitation of Cu awing to the
Choose an answer
Reduction of Cu
2+
Oxidation of Cu
2+
Reduction of Fe
Reduction of Fe
3+
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Question # 4
The total pressure exerted by a number of non reacting gases is equal to the sum of partial pressure of the gases under the same conditions is known as
Choose an answer
Boyle's law
Charle's law
Avogadro's law
Dalton's law
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Question # 5
Propyne on hydrolysis in presence of H
2
SO
4
and HgSO
4
gives
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Acetaldehyde
Actone
Formaldehyde
None
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Question # 6
All the naturally occurring processes proceed spontaneously in a direction which lead to
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Decrease of entropy
Increase of enthalpy
Increase of free energy
Decrease of free energy
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Question # 7
Chile salt petre is
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NaNO
3
Na
2
SO
4
KNO
3
Na
2
S
2
O
3
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Question # 8
Among the alkaline earth metals the element forming predominantly covalent compounds is
Choose an answer
Be
Mg
Sr
Calcium
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Question # 9
The molal elevation constant is the ratio of the elevation in boiling point to
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Molarity
Molality
Mole fraction of solute
Mole fraction of solvent
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Question # 10
When sulphur is boiled with Na
2
SO
3
solution the compound formed is
Choose an answer
Sodium sulphides
Sodium sulphates
Sodium persulphate
Sodium thiosulphate
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Question # 11
Reaction of ethylamine with chloroform in alcoholic KOH producers
Choose an answer
CH
3
OH
CH
3
NC
C
2
H
5
NC
C
2
H
5
CN
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Question # 12
Which is the most amphoteric?
Choose an answer
Na
2
O
MgO
Al
2
O
3
CaO
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Question # 13
How many moles of Helium gas occupy 22.4 L at 0°C at a atm. Pressure?
Choose an answer
0.11
0.90
1.0
1.11
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Question # 14
Phenol is heated with CCl
4
and alkaline KOH when salicylic acid is produced. The reaction is known as
Choose an answer
Frledel-Craft reaction
Riemer-Tiemann's reaction
Rosenmund's reaction
Sommelet reaction
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Question # 15
If the solvent is inflammable for heating purpose we use
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Ice bath
Water bath
Wire gauze
Thermostat
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Question # 16
Which of the following reaction is used for detecting presence of carbonyl group?
Choose an answer
Reaction with hydroxylamine
Reaction with hydrazine
Reaction with phenyl hydrazine
All
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Question # 17
Which one of the halogen acid is a liquid?
Choose an answer
HF
HCl
HBr
Hl
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Question # 18
DDT is formed from
Choose an answer
Benzene and Chlorobenzene
Chloral and Chlorobenzene
Chloral and benzene
Chlorobenzene and chlorine
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Question # 19
Helium-oxygen mixture is used by deep sea divers in preference to nitrogen-oxygen mixture because
Choose an answer
Helium is much less soluble in blood than nitrogen
Helium is much less soluble in blood than helium
Under the sea nitrogen and oxygen react to give poisonous nitric oxide
Nitrogen is highly soluble in water.
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Question # 20
Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBh
4
or LiAH
4
?
Choose an answer
1-Propanol
2-Propanol
2-Methyl2-Proponal
Ethanol.
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Question # 21
Which one of the following compounds does not exist?
Choose an answer
NCl
5
AsF
5
SbCl
5
PF
5
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Question # 22
Ethyl alcohol is industrially prepare from ethylene by
Choose an answer
Permanganate oxidation
Catalytic reduction
Absorbing in H
2
SO
4
followed by hydrolysis
Fermentation
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