Question # 1

Rectified spirit obtained by formentation contains 5% of water .So in order to remove it, rectified spirit is mixed with suitable quantity of benzene and heated Benzene helps because.

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It is dehydreating agent and so removes water

It forms the loweer layer which retains all the water so that alcohol can be distilled off

It form an azeotropic mixture having high boiling point and thus allows the alcohol to distall over

It forms low boiling azeotropic mixture which distille over leaving behind pure alcohol which can than be distilled.

In Dumas method, the volume of the gas collected is equivalent to which of the following gases set free from the compound.

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Ammonia

O2

N2

NO

Which of the following products is obtained when but 2-ene is treated with perchloric acid.

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CH3CHO only

CH3COOH only

CH3CHO and CH3COOH

CH3CH2COOH + HCOOH

Which of the following does not belong in the group of herocyclic dyes.

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Acridine

Cyanine

Methylene blue

Amido black

The formation of daughter DNA's from parent DNA is called.

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Transalation

Transcription

Reproduction

Replication

Which of the following is strong adheaive.

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Epoxy resin

Melamine -formadehyde resin

Alkyd resins

Bakelite

The electrophile in the sulphonation of benzene is.

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SO3

SO3H

HSO4

SO2

Which of the following statement is false about resonance.

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It increase the stability of a molecule

It leads to similar type of bonds

It increase the reactivity of the molecule

It decrease the reactivity of the molecule.

The number of optically active compounds in the isomers of C3H5Br3 is.

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1

2

3

4

Complete hydrolysis of nucleotide result in the formation of.

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Heterocyclic bases

A pentose

A phosphate ion

All of these

How many stereoisomers are possible for CH3CH = CHCHCH(Br) CH3

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2- geometrical isomers

2- optical isomers

2- geometricla nad 2- optical isomers

2- geometrical and 1 optical isomers

a-terpioneol is obtained on hydration of which of the following with dilute H2SO4.

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Citral

Myrcene

Linalool

Limonene

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.

Oxidative enzymes are responsible for

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Biological processes

Biological oxidation

Biological hydrolysis

Biological isomerisation

The decrease in electron density at one position accompanied by a corresponding increase at other position is called.

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Inductive effect

Asymmetric effect

Electromeric effect

Resonance effect

Which of the following is not a polysaccharide

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Cellobiose

Cellulose

Insulin

Amylase

Biogical role of nucleic acid doe snot include

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Genetic continuity

Protein syathesis

Hybridization

Mutation

Which of the following test is not shown by proteins.

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Xanthoproten test

Ninhydrin test

Hopkin cole test

Muliken Barker test

Which of of the following statement is not correct in respect of

Arrhenius concept.

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This concept is applicable only for aqueous systems.

Neutralization takes place in aqueous medium only

H+ ion concept remain as such in water

This concept is applicable for non aqueous system only.

Which of the following groups exert -1 effect.

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- NO2

- CN

-COOH

<C = 0

One arm of each t-RNA terminates in the base sequence.

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UGU

GGC

ACT

CCA

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