Question # 1

The species which are produced by heterolytic bond breaking and can act as electron pair donor

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Free radicals

Cations

Nucleophiles

electrophile

Acceptance of macromolecular hypothesis was due to efforts of:

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Kekule

Gibbs

Standiger

anderson

The standard reduction potential of Zinc is

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0.76V

0.34

-0.34V

-0.76V

The amount of heat required to vaporize one mole of liquid at its boiling point without change in temperature is called

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molar heat of vaporization

molar heat of sublimation

molar heat of fusion

none 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

2-propanol on Oxidation gives

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Aldehyde

Carboxylic Acid

Ketone

Alcohol

Which one is non-reducing sugar?

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sucrose

glucose

fructose

galactose

In the body fats are hydrolysed into:

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fatty acid and water

fatty acid

glycerol and water

acid and glycerol

Which of the following is Homopolymer

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Polyvinyl acetate

Acrylic resin

Polyester resins

Both A and C

NH³ shows a maximum boiling point among the hydrides of V-A group elements due to :

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very small size of nitrogen

lone pair of electrons present on nitrogen

enhanced electronegative character of nitrogen

pyramidal structure of NH³

Major cause of SO2 on global scale is

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Volcanoes

Electric sparks

Combustion

All

Sometimes a yellow turbidity appears while passing H₂S gas even in the absence of II group radicals. This is because

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Sulphur is present in the mixture as impurity

IV group radicals are precipitated as sulphides

Of the oxidation of H₂S gas by some acid radicals

III group radicals are precipitated as hydroxides

Number of isomers of butane are:

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One

Two

Three

Four

The spectrum of helium is expected to be similar to that of

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H

Li⁺

Na

He⁺

The most commonly and widely used nitrogen fertilizer in Pakistan is

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Urea

Ammonium nitrate

Ammonium sulphate

Ammonium chloride

To prepare ethanol by fernentation the optimum temp. is

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10 - 20°C

25 - 30°C

20°C

35°C

A fibre which is made from acrylonitrile as monomer

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PVC

Rayon fibre

Acrylic fibre

Polyester fibre

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Electronphilic substitution

Electrophilic addition

Free radical substitution

Nuclephilic substitution

How many secondary alcoholic groups are present in the structure of glucose OHC CHOH CHOHCH OH CHOH CH₂OH

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1

2

3

4

The order of distance between the various Bohr orbits is

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r₂- r₁> r₃- r₂> r₄- r₃> ......

r₁> r₂> r₂- r₃> r₄-r₃> .....

r₂-r₁= r₃- r₂= r₄- r₃> .....

r₂- r₁> r₃- r₂< r₄- r₃< ....

The sp²hybird orbitals are oriented in space at one angle

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180°

109.5°

100°

120°

Hydrolysis of Grignard's reagent gives:

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Alkane

Alkyl

Halide

Alcohol

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