Question # 1

Oceans cove ____________ percent of the surface of the earth

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60

70

80

97

Water is purified by:

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Filtration

aeration

coagualation

All of these

The amino group in 19 alpha-amino acids is primary; only one alpha-amino acid has secondary amino group which one is that

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Alanine

Glutamic acid

Glycine

Proline

During esterifcation, the alcobol molecule acts as:

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Oxidizing agent

Electrophile

Reducing agent

Nucleophile

Which one of the following is not a form of chemical bonding?

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covalent bonding

hydrogen bonding

ionic bonding

metallic bonding

Activity of the enzyme is reduced by

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temperature

concentration

pH

inhibitors

Equal masses of methane and oxygen are mixed in an empty container at 25∘C.

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1/3

8/9

1/9

16/17

Gas is enclosed in a container of 20cm3 with the moving piston. According to kinetic theory of gases, what is the effect on freely moving molecules of the gas if temperature is increased from 20°C to 100C.

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Colliding capability of molecule will become lower

Pressure will become one half

Temperature has no effect on freely moving molecules

Volume will be increased

If 250 cm³of hydrogen gas is cooled from 127°C to -73°C at constant pressure then new volume of gas is ______ dm³

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0.25

0.375

0.125

0.0625

The fat soluble vitamins are:

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A and B

B and C

C and D

A and D

In solid, the temperature is the measure of:

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Rotational kinetic energies.

Translational kinetic energies.

Vibrational kinetic energies.

None of above.

The fibre which is made form acrylonitrile as monomer

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PVC

Rayon fibre

Acrylic fibre

Polyester fibre

Each of the following is true of white and red phosphours except that they

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Are both soluble in CS₂

Can be oxidized by heating in air

Consist of the same kind of atoms

Can be converted into one another

Which is a good nucleophile?

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F^-1

Cl^-1

Be^-1

I^-1

Which one of the following has no units of its K_cvalue

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Absolute alcohol is obtained by adding rectified apirit in alcohol:

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Water

Na₂CO₃

NaOH

CaO

One calorie is equal

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4.132 J

760 J

4.184 J

1 J

Gasoline is a mixture of hydrocarbons containing carbon atoms

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5 to 10

5 to 8

5 to 12

5 to 11

The IUPAC name fo CH₃COCH (CH₃)₂is

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4-Methylisopropyl ketone

3-Methyl-2 butanone

Isopropylmethyl ketone

2 - Methyl- 2 butanone

Boric acid cannot be used:

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An antiseptic in medicine

For washing eyes

In soda bottles

For enamels and glazes

Steps in SN , reactions are:

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One

Two

Three

Four

The osmotic pressure of a dilute solution is directly proportional to the

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Diffusion rate of the solute

Ionic concentration

Elevation in boiling point

Flow of solvent from a concentrated to a dilute solution

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