Question # 1

The steroids of fungi and yeast are called:

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Vitamin D

Vitamin D₂

Ergosterol

Cholesterol

Styrene has empirical formula CH, and there is 92.2%C and 7.75% hydrogen. If molar mass is 104g mol¯, what will be integral multiple (n) to get molecular formula:

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2

4

6

8

All of the following substances are crystalline except:

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carbon

ice

plastic

sucrose

In most of the cases the molecular crystals are

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very soft

soft

extremely hard

sufficiently hard

Large molecule formed by combination of smaller units these smaller units are called:

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Polymers

Macromolecule

Micromolecule

a & b

Formula of sodium beryllite is

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Na2B4O7

Na2BeO2

BeONa

Na2B4O7 .10 H2O

Ice floats on water because

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the hydrogen bonding in ice is stronger than that of in water

empty spaces are left in ice

ice has two-dimensional structure

the bond length of the oxygen and hydrogen bond is different in water and ice

If absolute temperature of a gas is doubled and pressure is reduced to one half, then the volume of the gas will

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remains unchanged

increases unchanged

reduces to 1/4

increases 4 times

The volume of gas depends upon the------- moleules

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Size of

Space between

Molecular weight

both a and b

The normal amount of overhead ozone is about

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250 Du

300 DU

350 DU

400 DU

The reduction potentials of non-metals are A =+0.54V, B=+1.08V, C=+1.36V. D= +2.87V Which non -metal can displace all other from aqucous solution of their salts

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A

C

B

D

Which of the following substances is used as an antiknock compound?

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Tetraethyl lead

Lead tetrachloride

Lead acetate

Ethyle acetate

The solubility of a gas in water depends upon

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Nature of the gas

Temperature

Pressure of the gas

All of the above

Alcohols of low molecular weight are

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Soluble in water

Soluble in water on heating

Insoluble in water

Insoluble in all solvents

Butanenitrile is formed by reaction of KCN with

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Propyl alcohol

Butyl chloride

Butyl alcohol

Propyl Chloride

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Elimination Esterification

Elimination Isomerisation

Oxidation Exterification

Oxidation Oxidation

Ether shows the phenomenon of

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position isomerism

Chain isomerism

Metamerism

Cir-trans isomerism

Which of the following is a molecular diseases?

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Allergy

Cancer

German measles

Sickle cell anemia

Ozone in most of the tropical regions acts as a pollutant and causes

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Damages to eyes

Aggravates asthma

Chest discomfort

All of these

The carbon, carbon bond length in benzene is

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1.54A°

1.34A°

1.20A°

1.39A°

An artificial smell of banana is produced in many articles y using esters which of the following is that

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Amyl acetate

Isoamyl valerate

Octyl acetate

Methyl butyrate

Which decolourizes the colour of Br₃

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CH₄

CH_3-CH₃

CH_3-CH_3-CH₃

CH₂₌CH₂

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