Question # 1

Ethene can give all of the following reactions except

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Addition

Free radical substitution

Hydrohalogenation

Hydration

How many CI^- ions are there around Na+ ion in NaCI crystal?

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3

4

6

8

Silk is an example of:

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animal fiber

vegetable fiber

mineral fiber

none of all

In many countries plastic waste is collected separetaly and sorted.Some of this is incinerated to provide heat for power stations.
Why is pvc polyvinylchloride,removed from any waste that is to be incinerated?

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It can be melted down and re-used

its combustion products are harmful

it destroys the ozone layer

it does not burn easily

Which is the correct order of boiling points

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structure of ice

solution of ethanol in water

solution o fNaCl in benzene

linking of helix protein molecule

By increasing temperature,the transition from a gas to an ionized gas gives free electrons called:

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UV radiation

gas phase

plasma

vapour density

The substances which soften the polymer are called

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stabilizers

plasticizers

retarders

pigments

Which statement explains why the boiling point of methane is higher than that of neon?

[A_r:H.1:c,12:Ne,20]

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A molecule of methane has a greater mass than a molecule of neon

Molecules of methane form hydrogen bonds but those of neon do not

Molecule of methane have strongel intermolecular forces than those of neon

The molecule of methane is polar, but that of neon is not

In SO-²4 the oxidation number of sulphur is

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-8

-6

+8

+6

What is the reason of ionic solids for not conducting electricity?

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free electrons are less

ions don't have translatory mention.

ions don't have translatory mention

the coordination number of the ion is very high.

Which of the following laws study the pressure-volume relationship of a gas at constant temperature,we get

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a straight line

a curve with different peaks

straight line parallel to x-axis

a curve called isotherm

Which of the following particles has longest wavelength, if they have same speed:

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Proton.

Neutron.

Electron.

Positron.

In sixth period 14 of its transition elements are called

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Lanthanides

Actinides

Radioactive elements

None

Transition elements differ from s and p block elements due to their characteristic properties. What is not he characteristic property of transition elements

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Transition elements show variable oxidation states

Their salts are coloured

They can be used as catalyst

All of them are metals

Which of the following statements about acetic, anhydride is not correct

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It is immiscible with water but is hydrolysed to give acetic acid

It is prepared by the action of actyl chloride on the sodium salt of acetic acid

it reacts with ammonia to give acetamide

it is a strong acid

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1, 5-pentadiene

Penta-1, 4-diene

1, 1-pentadiene

1, 4-pentene

1-Chlorobutane on reaction with alcoholic potash gives

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But 1-ene

Butan-1-ol

But-2-ene

Butan-2-ol

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Increases

Decreases

Remains same

Cannot be predicted

Preparation of ethylbenzene by the reaction of bromobenzene, ethylbromide and sodium is called

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Wurtz reaction

Fitting reaction

Wurtz fitting reaction

None of these

The atomic radius increases as we move down a group because

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Effective nuclear charge increases

Atomic mass increases

Additive electrons are accommodated in new electron level

Atomic number increases

The state of hybridization of carbon atom in methane is:

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sp³

sp²

sp

dsp²

Inter molecular forces in solid hydrogen are

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Covalent forces

Van der Waal forces or London dispersion forces

Hydrogen bonds

All of these

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