Question # 1

Acceptance of macromolecular hypothesis was due to efforts of:

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Kekule

Gibbs

Standiger

anderson

The pressure exerted by gas molecules is due to their

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collisions

densities

masses

kinetic energy

Grey tin crystals belong to

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tetragonal

cubic

orthorhombic

rhomtrohedral

Super conductors are derived from compounds of

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P-block elements

Lanthanides

Actinides

Transition elements

The cause of deviation form ideal behaviour is because

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the actual volume of gas molecules is not negligible

there is force of attraction between molecules of a gas

both a and b

none of these

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

consider the physical properties of the gases. Which of the following statements about particles of gases is incorrect? The particles are:

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causing pressure

having wide spaces

orderly arranged

randomly moving

The weakest intermolecular forces present in a liquid may be

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Dipole-induced dipole forces

dipole-dipole forces

instantaneous forces

electrostatic forces between ions in a ionic solid

The derivatives that cannot be prepared directly from the acetie acid

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Acetamide

Acetic anhydride

Ethyl acetate

Ester

The Kw. of water at 25 C° is given by

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10(-7)

10(-10)

10(-12)

10(-14)

The enthalpies of all elements in their standard states are

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Unity

always +ve

always -ve

zero

Reaction of Grignard's reagent eith aldehyds other formaldehyde gives: Reaction of Grignard's reagent with formaldehyde gives:

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Pri-alcohol

Sec-alcohol

Ter-alcohol

Carboxylic

Which polymerization is free radical machanism based

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Addition

Condensation

Both a and b

None

Benzene is obtained by fractional distillation of

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Heavy oil

Anthracene oil

Middle oil

Light oil

Compared to a 1.0M aqueous solution of calcium chloride will have

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The same freezing and boiling point

A lower freezing point and lower boiling point

A lower freezing point and higher boiling point

A higher freezing point and higher boiling point

Aldehydes is distinguished from ketones by using

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Tollen's reagent

Benedict reagent

Fehling solution

All of the above

Which of the following is a molecular diseases?

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Allergy

Cancer

German measles

Sickle cell anemia

Which of the following statements is correct?

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Phenol is less acidic than ethyl alcohol

Phenol is more acidic than ethanol

Phenol is more acidic than carbonic acid

Phenol is more acidic than CH₃COOH

50 cm³of 0.05 molar nrea (N₂H₄CO) solution has % W/N concentration

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6%

3%

0.3 %

0.6 %

β-D-glucose is a monomer for

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Strach

Cellulose

Glycogen

Protein

Composition of clay in cement is:

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25%

50%

75%

80%

Chromyl chloride and toluene react to produce

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p-chlorotoluene

Benzaldehyde

Benzyl chloride

Bezoic acid

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