Question # 1

The stationary and mobile phases in paper chromatography are.

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^{Liquid/Liquid}

Solid /Liquid

Liquid/Solid

Gas/solid

Which of the following hydrocarbon cannot be obtained on reacting chloomethane with sodium metal in the presence of dry ether.

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C4 H10

C2H6

C2H4

C3H8

Which of the following is most acidic.

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Phenol

p-nitrophenol

o-Nitrophenol

m-Nitrophenol

An induction of dipole or polarity in non polar bond, and consequent electron shifting along a chain of atoms is known as.

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Inductive effect

Resonance effect

Hyper conjugation

None of the above

Lactic acid is a molecule which shows

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Epimersim

Tautomerism

Opical isomerism

Metamerism

The number of hydrogen bonds boding A _____ T pair is

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1

2

3

4

The unit of nucleic acid having base sugar combination is called.

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Nucliec acid

Nucleoside

Nucleotide

None of these

What is the activation energy of a reaction whose rate constant increases by a factor of 100 upon increasing the temperature from 300 K to 360 K.

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27

35

42

69

Homolytic fission of convalent bond results in the formation of.

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Free redicals

Carbocations

Carbonions

Both B and C

The process of transfer of genetic message from DNA to m-RNA is known as

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Refplication

Translation

Transcription

Transference

Among the following statements in the nitration of aromatic compounds, the false one is.

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The rate of nitration of benzene is almost the same as that of hexadeutero benzene

The rate of nitration of toluene is greater than that of benzene

The rate of nitrationof benzen is greater than that of hexadeutero benzene.

Nitration in an electrophite substitution reaction.

Which of the following compounds would you use in order to obtain a crystalline derivative of an aromatic amine.

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2,4 Dinitrophenyl hydrazine

Nitrous acid

Benzoyl chlride

None of these

Identify a dye which was ot originally obtained from plant source.

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Alizarin

Tyrian purple

Indigotin

Quercitrin

Glycine reacts with nitrous acid to form

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Methyl amino

Acetic acid

Zwitter ion

Glycollic acid

Amino acids have

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Acidic group

Basic group

Both of these

None of these

The half life for a first order reactions 32 s, What was the original concertation if after 2.0 minutes, the reactant concentration is 0.062 M.

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0.84 M

0.069 M

0.091 M

0.075 M

The product obtained on heating n-heptane with Cr2O3 ____Al2O3 at 600 ^oC is.

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Cycloheptane

Methyl cyclohexane

Benzene

Teluene

Which of the following statements are correct for Linear polymers.

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Linear polymers may be condensation as well as addition polymers

Structure is well packed in nature

Linear polymers have higher density higher melting point and higher tensile strength

All are correct

Molecular weight of proteins may be determined by

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Osmotic pressure measurements

Sedimentation methods

Light scattering methods

All of these

Which of the following statements do not represent Lewis idea of acids and base?

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Compounds which have completely filled orbitals

Compounds which have incompletely filled orbitals

Compounds in which the central atom can expand its octel

All simple metal ions like Ag+, Al3+ etc.

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