Question # 1

During the nitration of benzene the nitrating agent is

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NO3

NO2+

NO2-

HNO3

Formalin contains-------% alcohol.

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37

80

8

52

Change in enthalpy (∆H) of a system can be calculated by

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∆H=∆E - PV

ΔH =ΔE +q

∆H = ∆E - q

∆Η = ΔΕ + P∆V

As the number of carbon atoms increase the number of isomers also increase. The six carbon compound hexane has as many as:

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10 isomers

3 isomers

5 isomers

6 isomers

The highest melting point is observed by

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Butanoic acid

Propanoic acid

Pentanoie acid

HCI

C-H bond length in the benzene is

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0.99A°

1.09A°

1.12A°

1.34A°

What is the effect of polluted air on environment:

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ozone

acid rain

global warming

smog

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destroy

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10,000

20,000

100,000

50,000

Biochemical oxygen demand (BOD) is the capacity of organic matter in natural water to consume oxygen with in a period of:

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2 days

6 days

5 days

7 days

Elements of group ll-A are called

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f-block elements

s-block elements

p-block elements

d-block elements

Polyesters resins have special use in:

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Clothing

Paints

Emulsion

Floor covering

The tendency of an atom to attract shared electron pair towards itself is called

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Covelent bond

Electronegativity

Ionization potential

Electronic affinity

Analytical chemistry is the science of :

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Chemical Characterization.

Physical Characterization.

Biological Characterization.

Biochemical Characterization.

The order of decreasing ease of reaction with ammonia is

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Anhydrides, esters, ethers

Anhydrides, ethers, esters

Ethers, anhydrides, esters

Esters, ethers, anhydrides

Which halide among the following is used as methylating agent?

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CH₃l

C₂H₅Cl

C₂H₅Br

C₆H₅Cl

The ore CaSO₄2H₂O has the general name

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Gypsum

Dolomite

Calcite

Epsom salt

What is the maximum mass of aluminium which can be obtained from 240g of aluminium oxide Al₂O₃?

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26 g

127 g

51 g

108 g

General formula of carbocyclic acids is:

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RCOH

RCOR

RCOOR

R-OH

Which of the following does not react with phenyl hydrazine?

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Ethanol

Ethanal

Acetone

Acetophenone

Which one of the following particles has amass 1/1836 time, that of hydrogen?

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Neutron.

Proton.

Electron.

Positron.

Organic compounds resemble to those of inorganic compounds having same

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Ionic properties

Carbon forming long chain or rings

Chemical forces

Isomerism

During dehydration of alcohols to alkenes by heating with conc. H₂SO₄, the initial step is

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Formation of an ester

Protonation of alcohol molecule

Formation of carbocation

Elimination of water

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