Question # 1

The reaction of formaldehyde with HCN is

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Nucleophilic substitution

Electrophilic substitution

Nucleophilic addition

Free radical addition

Amylose and Amylopectin are two fraction of starch which of them gives violet colour with I₂

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Amloase only

Amylopectin only

Both amlose & amylpectin

None of thses

The polymers which can be re-softened again and again are called

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Thermoplastic

Thermosetting

Both a and b

None

polymerisation of vinyl chloride gives PVC:
How does the carbon-carbon bond in PVC compare with that in chloroethene?

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longer and stronger

fructose

sucrose

starch

According to kinetic theory of gases there are

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Intermolecular attractions

Molecules which have considerable volume

No intermolecular forces of attraction

The velocity of molecules decreases for each collision.

Daily protein intake for normal adults should be:

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0.2g/kg

0.5g/kg

0.8g/kg

1.1g/kg

Methyl mercaptan, CH₃SH, is one of the substances responsible for bad breath and is often used to impart a smell to natural gas in a pipeline.
What will be formed when CH₃SH is burned in an excess of air?

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CO CO₂ H₂S

CO H₂O SO₃

CO₂ H₂O SO₂

CO₂ H₂O SO₃

As gases can adopt the shape of the container. Therefore gases have:

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different shapes

fixed shapes

no fixed shapes

definite shapes

Simplest Structure of a protein that has only covalent bonding between amino acids is

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2° structure

3°structure

1° structure

4° structure

Liquids are less common than:

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Solids.

Plasmas.

Gases.

All of above.

The factor responsible for lower mercury level in a capillary tube is

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High density

Surface tension

Liquid state

Metallic Colour

Result of ozone hole is

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Green house effect

Global warming

Acid rain

UV rays reach the earth

Direct conversion of solid intro vapours is called:

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Crystallization

Sublimation

Obligation

Vapourization

Which one of the following is a water soluble vitamin?

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Naacin

Riboflavin

Trypsin

Ascorbic acid

A ring contains 3 gram diamond. The number of C-atoms which a ring contains is

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3.01 x 10²³

1.5 x 10²³

6.02 x 10²⁴

3.01 x 10²⁴

Bohr model of atom is contradicted by:

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Planck's quantum theory

Pauli's exclusion theory

Heisenberg's uncertainty principle.

All of above.

The color of ppts formed by Fehling's test is

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Brick red

Red

Yellow

Orange

When the rate of reaction is entirely independent of the conc. of reaction molecules then order of reaction is

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Zero

First

Second

Third

Hydrolysis of trichloromethane with aqueous KOH gives

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Potassium formate

Acetylene

Chloral

Methanol

Cannizzaro's reaction is type of reaction:

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Self oxidation-reduction reaction

Disproportion reaction

Addition

A and B

The third line of the Balmer series, in the emission spectrum of the hydrogen atom,is due to the transition from the

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Fourth Bohr orbit to the first Bohr orbit

Fifth Bohr orbit to the second Bohr orbit

Sixth Bohr orbit to the third Bohr orbit

Seventh Bohr orbit to the third Bohr orbit

The number of electron pairs shared in carbon tetrachloride molecule is

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2

3

4

1

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