Question # 1

Nitrogen in the atmosphere is:

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78%

21%

0.9%

0.03%

The destruction of the biological nature and activity of proteins by heat or chemical agent is called:

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Dehydration

Oxidation

Denaturation

Polymerization

Which one is a non-polar compound?

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SnCl2

PH3

Gecl4

H2O

Cement is mixture of so many compounds roasted in rotary kiln.Which substance has greater percentage:

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Lime

Alumina

Silica

Magnesia

The instrument that is used to measure the pressure of a gas is called

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viscometer

photometer

barometer

stalagmometer

In the transition state of S2 mechanism reaction with alkyl halides, which of the following orbital hybridization is involved

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sp³

sp

sp²

dsp³

Which of the following polymers is used for weather resistant paints

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acrylic resins

polyvinyl acetate

polystyrene

PVC

The maximum possible number of hydrogen bonds in which a H₂O molecule can participate is:

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1

2

3

4

Which of the following is not a property of enzymes?

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extraordinary speciffcity

reversibility of reactions

high efficiency

minimum activity at optimum T

Which compound shows the highest melting point

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water

Propanoic acid

Methanoic acid

Ethanoic acid

Acidification of soil can leach metal:

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Al

Hg

Pb

Ca

Which of the following is not a fertilizer

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Nitrophos

Dolomite

Super phosphate of lime

Urea

Choose the correct answer of transition elements?

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Transition elements have low melting points

Transition elements do not have catalytic activity

Transition elements exhibit variable oxidation states

Transition elements exhibit inert pair effect

A reaction in which heat is given out is

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An endothermic reaction

An exothermic reaction

A thermochemical reaction

An energetic reaction

The largest item which is recycled is

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Newspaper

Plastic

Aluminium

Oil

Which of the following is not an element?

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Graphite

Diamond

22-Carat gold

Rhombic sulphur

Fatty acids are:

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Allphatic monocarboxylic acids

Dicaroxylic acids

Tricarboxylic acids

Tetracarboxylic acids

Poly carboxylic acids

Which reaction is too vigorous to control

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Chlorination

Bromination

Iodination

Fluorination

H₂+ L₂----2Hl

In the above equilibrium system, if the concentration of reactants at 25°C is increased, the value K_C will :

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Remains Constant

Increases

Cecreases

Depends upon nature of reactans

The elements of f-block are also known as

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Inner-transition

Outer transition

Normal elements

Alkaline earth metals

Major component of natural gas is:

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Ethane

Ethene

Propane

Methane

Which of the following is acidic?

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SO₃

N₂O

BeO

HgO

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