Question # 1

Grignard's reagent on treatment with carbonyl compounds yield

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Pheonol

Alcohol

Alkane

None of these

Where energy is released during a reaction it is

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Exothermic reaction

Endothermic reaction

A free radical reaction

A bond breaking reaction

Molecules of High molecular weight usually greater than 10,000 are called:

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Macro molecules

Mega molecules

Poly molecules

Gega molecules

The characteristic reactions of alkanes are

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Addition reactions

Substitution reactions

Condensation reactions

Polymerization reactions

One of the environmental problem is the formation of oil slicks when oil is spilled from tankers in sea water. Which treatment is suitable to remove oil slicks

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Blow air

Add Na₂CO₃

Use a specially made sorbent having flouring trapped in it

Use a sorbent having Al₂O₃trapped in it

Sulphur dioxide affects

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Cell wall

Plasmodesmata

All membrane systems

Nucleus

An electron with n = 3 , l = 2 will be in the sub-shell

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3p

3d

3f

3s

Which of the following discoveries resulted in a version of the Mendeleefs

periodic law

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The nucleus of atom by Rutherford

The elements polonium and radium by the Curies

Atomic numbers by Moseley

x-rays by Roentgen

The number of unpaired electrons in the p-subshell of oxygen atom

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1

2

3

4

Which of the following is a nucleophile

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OH

CH(CH₃)₃

CH₃⁺

CH₃CH₂CH₃

The amino group in 19α-amino acids is primary; only oneα-amino acid has secondary amino group which one is that

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Alanine

Glutamic acid

Glycine

Proline

Charge to mass ratio (e/m) of the electron is determined by

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R. A. Millikan

J. J. Thompson

G. J, Stoney

None of these

Phenol is used in the preparation of

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Bakelite

Phenatherene

Cellulose

All of these

Which of these polymers is a synthetic polymer

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Animal fat

Starch

Cellulose

Polyester

Which of the following molecules has zero dipole moment>

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NH₃

CHCl₃

H₂O

BF₃

Shielding effect intervening electrons causes

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Decreases in atomic radii in a period from right to left

Increase in atomic radii in a period from left to righ t

Decrease in atomic radii down the group

Increase in atomic radii down the group

Fossil fuels consist of :

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Coal

Natural gas

Petroleum

All of these

The sp²hybird orbitals are oriented in space at one angle

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180°

109.5°

100°

120°

The oxidation number of each element of group l-A is

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0

+1

+2

-1

The osmotic pressure of a dilute solution is directly proportional to the

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Diffusion rate of the solute

Ionic concentration

Elevation in boiling point

Flow of solvent from a concentrated to a dilute solution

The number of moles of solute dissolved per dm³of the solution is called :

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Normality.

Molarity.

None of above.

Monosaccharides are

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Aldoses

Ketoses

Either a and b

None of these

A complete chemical characterization of a compound must include

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Qualitative analysis

Chemical analysis

Quantitative analysis

Both a and c

Which of the following represents elements in order of increasing atomic size?

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I, Br, Cl

Na, Mg, C

C, N, O

Li, Na, K

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

A compound R has all of the following properties. It is neutral; It gives an orange precipitate with 2,4-dinitrophenythydrazine; it evolves hydrogen chloride when treated with PCI₅in the cold What could R be

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Which of the following compounds gives red precipitate with AgNO₃?

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Kl

K₂CrO₄

NaBr

NaNO₃

The gasoline with high octane No. has ______

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More knocking

Less knocking

No knocking

Only knocking

Which of the following half molar solutions will have lowest freezing point

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Solution of non-volatile, none electrolyte

Solution of non volatile, weak electrolyte

Solution of non volatile strong electrolyte

Solution of volatile, non electrolyte

The polymers which can be re-softened again and again are caled

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Thermoplastic

Thermosetting

Both a and b

None

What is the molarity of the solution that contains 20 grams of NaOH in 500 ml of solution [Na = 23, O = 16, H = 1]

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0.25

0.5

1

20

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