Question # 1

Theα-carbon of 19 out of 20α-amino acids found in protein is chiral or asymmetric. Hence they are optically active. Only one of the 20α-amino acids is not optically active which one is the

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Proline

Glycine

Hitidine

Alanine

Ifα us the degree of dissociation of Na₂SO₄the vant Hoff's factor (1) used for calculating the molecular mass is

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1 +α

1 -α

1 + 2α

1 - 2α

Benzene reacts with chlorine to form benzene hexachloride in presence of

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Nickel

AlCl₃

Bright sunlight

Zinc

A compound containing carboxyl group in them are called:

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Ketone

Ether

Carboxylic acids

Polycarboxylic acid

Which of the following is not present in nucleotide?

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Guanine

Cytosine

Adenine

Tryoxine

Diethyl ether is obtained by Williamsons synthesis using

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Ethanol + Na + C₂H₅Br

Ethanol + Mg + C₂H₅Br

Methanol + Na + CH₃Br

Methanol + Mg + CH₃Br

The number of electron that are paired in oxygen molecule are

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16

12

14

7

According to the SI-system heat contents are measured in units of

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Calorie

Joules

Ergs

Watts

Aldehydes are produce in atmosphere by

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Oxidation of secondary alcohols

Reduction of alkenes

Reaction of oxygen atoms with hydrocarbons

Reaction of oxygen atoms with ozone

Catalyst in the reaction ROH + SOCl₂-------> RCL+SO₂+HCl is:

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ZnCl₂

Pyridine

H₂SO₄

Either

To get DDT, chlorobenzene has to react with one of the following compound in the presence of conc.H₂SO₄

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Trichloroethane

Dichloroacetone

Dichloroacetaldehyde

Trichloroacetealdehyde

The temp. used for the hydrogenation of alkenes using Ni is

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2000°C

400°C

200-- 300°C

1000°C

Electron affinity depends on

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Atomic size

Nuclear charge

Atomic number

Atomic size and nuclear charge both

The process in which the solvent molecules are surrounded and interact with solute ions or molecules is called

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Solvation

Hydration

Hydrogenation

None

Which of the following species participate in sulphonation of benzene ring?

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H2SO4

HSO4

SO3

SO^-₂

β-D-glucose is a monomer for

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Strach

Cellulose

Glycogen

Protein

Pure water does not conduct electricity because it

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Has low boiling point

Is almost unionized

Is neutral

Is readily decomposed

Replacement of hydrogen atom by - SO₃H group in benzene is called

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Nitration

Alkylation

Sulphonation

Acylation

The solutions of NaCl and KCl are prepared separately by dissolving same amount of solute in water, which of the following statements is true fro these solutions ?

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KCl solution will have higher boiling point than NaCl solution.

Both the solutions have same boiling points.

KCl and NaCl solutions possess same vapour pressure.

KCl solution possesses lower freezing point than NaCl solution.

Carboxylic acids are reduced to in presence of NaAIH₄

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Esters

Acetyl chloride

alcohol

Aldehydes

The amount of Si in the lithosphere is about

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27.72%

30.35%

35.30%

40.21%

When acetylene is passed through a copper tube at 300°C, it polymerizes to

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Polyacetylene

polyethylene

Benzene

None of these

The ph of 10-3 mole dm-3 of an aqueous solution of H₂SO₄ is :

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3.0

2.7

2.0

1.5

Hydrolysis of alkyl nitriles is done to get carboxylic acids in the presence of

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Mineral acids

Mineral alkalies

Organics acids

Minerals acids & alkalies

SN₂reaction has order of reaction :

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First

Second

Third

Zero

When 6s orbital is complete then next electron goes to

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6p

6d

5d

4f

Monocarboxylic acids exist as dimer because of

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Dipole-dipole attraction

Hydrogen bonding

Van der Waals forces

Conhesive forces

A reaction is reversible because :

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Products are stable.

Reactants are reactive.

Products are reactive.

Reactants re stable.

Oxidation of methyl alcohol gives

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Formaldehyde

Acetone

Ester

Acid

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High temperature

Low temperature

Low pressure

High pressure

Group VA of the periodic table consists of the elements N, P, As, Sb and Bi, On passing from N to Bi, the oxides of the elements of general formula M₂O₃become

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Stronger reducing agents

More ionic

More basic

More volatile

More Classes

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