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NAT II Biological Science Chemistry MCQs With Answers
Question # 1
Cannizzaro reaction is not given by
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Trimethyl acetaldehyde
Acetaldehyde
Benzaldehyde
Formaldehyde.
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Question # 2
In the manufacture of iron from haematite, limestone is added to act as.
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Flux
A reducing agent
Slag
An oxidizing agent
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Question # 3
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 # 4
Which of the following halogens does not form its oxyacids?
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F
Cl
Br
I
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Question # 5
SO
2
and NO
2
produce pollution by increasing
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Alkalinity
Acidity
Neutrality
Buffer action
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Question # 6
Which of the following units represents largest amount of energy?
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Calorie
Joule
Erg
Electron vol.
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Question # 7
Which one is not a pollutant normally?
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Hydrocarbons
Carbon dioxide
Carbon monoxide
Sulphur dioxide
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Question # 8
The following has zero valency
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Na
Be
Al
Kr
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Question # 9
Gooch crucible is used for the filtration of precipitates having
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High Solubility
High concentration
High ignition temperature
Low Temperature
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Question # 10
The number of electrons in the M shell of the element with atomic number 24 is
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24
12
13
8
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Question # 11
As a fixing agent in photography, sodium thisoulphate is used for
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Dissolving out unreacted silver bromide
Converting silver halides to metallic silver
Reducing solubility of AgBr
Preventing overdeveloping and fogging.
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Question # 12
Which has maximum protein content?
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Ground nut
Cow milk
Egg
Wheat
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Question # 13
The wire in the flash bulbs is made up of
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Mg
Ba
Cu
Ag
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Question # 14
Bromine is obtained on a commercial scale from
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Caliche
Carnallite
Common satl
Cryolite
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Question # 15
The unit rate of a reaction can be increased in general by all the factors except by
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Using a catalyst
Increasing temperature
Increasing the activation energy
Increasing the conc. of reactants
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Question # 16
Which of the following nitrogen fertilizer contain more nitrogen
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NaNO
3
KNO
3
NH
4
NO
3
Urea
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Question # 17
Sulphure dioxide affects
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Cell wall
Plasmodesmata
All membrane systems
Nucleus
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Question # 18
Natural fertilizer provides potassium in the form of K
2
O (potash)
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1.5 kg
3 kg
4.5 kg
6.5 kg
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Question # 19
Oleum is
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Castor oil
Oil of vitriol
Fuming of H
2
SO
4
None of them
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Question # 20
Which is not a a colligative property?
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Osmotic pressure
Lowering of vapour pressure
Depression of freezing point
Elevation of boiling point
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Question # 21
Among the alkaline earth metals the element forming predominantly covalent compounds is
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Be
Mg
Sr
Calcium
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