Question # 1

Ethylene polymerizes at 100 atm pressure and 400 °C to give

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Polybenzene

Polypropylene

Polyalcohol

Polyethylene

SO₂produced by volcanoes is about

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75%

67%

69%

70%

Which one of the following is not true of metallic bonding?

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it gives rise to excellent electrical conductivity

electrons are following to move throughout the structure

the strength of metallic bonds increases down a group

the strength of metallic bonding affects the boiling point of metals

The rate of diffusion of a gas is:

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Inversely proportional to its density.

Inversely proportional to square root of its molecules mass.

Directly proportional to molecular mass.

Directly proportional to its density.

For which mechanisms, the first step involved is the same

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E1 and E2

E2 and SN2

E2 and E1

E1 and SN1

Helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is

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same as that of a hydrogen molecule

half that of a hydrogen molecule

two times that of a hydrogen molecule

four times that of hydrogen molecule

How should the conditions be changed to prevent the volume of a given gas from expanding when its mass in increased

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temperature is lowered and pressure is increased

temperature is increased and pressured is lowered

temperature and pressure both are lowered

temperature and pressure both are increased

Liquefaction of gas can only be carried out if the:

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without caring for the value critical volume at critical stage

the temperature is more than critical and pressure is 1000 atm

the temperature is below the critical and pressure is very high

temperature is above the critical temperature and pressure can have any value

The main source of natural fibre is

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animal fibres

vegetables fibres

mineral fibres

all of the above

Choose the example having hexagonal system:

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graphite

sugar

sulphur

diamond

Anthracene contains number of fused benzene rings

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1

2

3

4

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Acidified AgNO_3(aq)

Fehling's solution

Na

Na₂XO_3(aq)

The rate of reaction b/w two specific time intervals is called :

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Instantaneous rate of reaction.

Average rate of reaction.

Rate of a reaction.

Minimum rate of a reaction.

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Decrease in temperature favour more dissolution of the salt

Increase in temperature favour more dissolution of the salt

Lowering pressure favour more dissolution of the salt

Increasing pressure favour more dissolution of the salt

In an ooctahedral crystal field splitting, the number of orbitals pushed down in energy is

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3

2

5

Zero

Water H₂O is liquid while hydrogen sulphide H₂S is a gas beause

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Water has higher molecular weight

Hydrogen sulphide is a weak acid

Sulphure has high electronegativity than oxyhe

Water molecules associate through hydrogen bonding

How many molecules of chlorine adds in benzene in the presence of sunlight

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One

Two

Three

Four

The number of unpaired electrons in ferrous ion ( Z - 26) is

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3

2

4

5

The ph of 10-3 mole dm-3 of an aqueous solution of H₂SO₄ is :

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3.0

2.7

2.0

1.5

Hydrolysis of ethyl-acetate (ester) has order of reaction :

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3

2

1

Inn which of these processes are small organic molecules made into macromolecules?

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The cracking of petroleum fractions

The fractional distilation of crude oil

the polymerization of ethane

The hydrolysis of proteins

Concentration of rectified spirit is:

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12%

14%

90%

95%

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