Question # 1

Which one among the following is not a natural polymer

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Protein

Cellulose

Nylon

Nucleic acid

A single chlorine free radical can destory how many ozone molecules

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10

100

1000

10000

Electrolytic products of dilute aqueous solution of sodium sulphate is

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Na. SO2

H2. S02

Na. O2

H2,O2

Which if the following will have the same number of molecules at S.T.P?

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280cm³ of CO₂ and 280cm³ of N₂O

11.2dm³ of O₂and 32g of O₂

44g of CO₂and 11.2dm³ of CO

28g of N₂and 5.6dm³ of oxygen

Hardness of diamond is attributed to the

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strength of the ionic bonds in the structure

three-dimensional network of covalent bonds

absence of valence electrons in carbon atoms

When calcium formate and calcium acetate are dry heated they form

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НCOOH

C2H5OH

CH3CHO

HCHO

Which is an intermediate in SN1 reaction

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Ethoxide ion

Carbocation

alkyl halide

alkene

What is the numerical value of 'R; (the gas constant) in S.I units?

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83143 J/mole/K

Avogadro's law

83.143 J/mole/K

8.3143 J/mole/K

Ocean contains part earth's water:

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95%

96%

97%

98%

Which is the optimum temperature for the activity of enzyme

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20 - 35°C

10 - 15°C

55 - 70°C

35 - 55°C

The elements of group I-A react violently with water and make the solution

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neutral

amphoteric

acidic

alkaline

Those amino acids which contain two carboxylic groups are called ______ amino acids

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Acidic

Basic

Neutral

None of these

Any substance in the environment which adversely affects the human health and natural functioning of the Ecosystem is known as

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Environment

Hydrosphere

Pollutant

Biosphere

Two solutions of NaCl and KCl are prepared separately by dissolving 0.1 M of the solute in water. Which of the following statements is not true for these solution

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KCl solution will have higher boiling point than NaCl solution

Both the solutions have same boiling

KCl and NaCl solution possess same vapour pressure

KCl solution possess same freezing point at NaCl solution

Wohler synthesized first of all the organic compound:

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Carbohydrates

Urea

Aniline

Toluene

Benzene does not undergo

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Substitution reaction

Addition reaction

Oxidation reaction

Elimination reaction

The raw material to form nylon is

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Adipic acid

Butadiene

Isoprene

Ethylene

Unpleasant smell of carbylamine is obtained when chloroform and alcoholic KOH are heated with

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Any aromatic amine

Any primary amine

Any amine

Any aliphatic amine

The correct order of electron affinity among the following is

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F > Cl > Br

Br > Cl > F

Cl > F > Br

F > Br > Cl

I-Chloropropane has two isomers, it is an example of

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Chain isomerism

Position isomerism

Functional group isomerism

Metamerism

In Antarctica ozone depletion is due to the formation of following compound

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Acrolein

Peroxy acetyl nitrate

SO₂and SO₃

Chlorine nitrate

Carboxylic acids on complete reduction in the presence of HI and red Phosphours gives:

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esters

alcohols

alkanes

aldehydes

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