Question # 1

The number of resonating structures of phenoxide ion are

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3

5

6

4

Which one increases by common ion effect except?

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Crystallization

Solubility

Association of ions

All of these

Ozone is most of the tropical regions acts as a pollutant and causes

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Damages to eyes

Aggravates asthma

Chest discomfort

All of these

Zn has

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Zero unpaired electrons

Three unpaired electrons

Five unpaired electrons

One paired electrons

The clotting time of blood is increased due to the deficiency of

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vitamin A

vitamin K

vitamin D

vitamin C

Ozone layer is high:

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20-23 km

22-25 km

23-26 km

25-28 km

The gas which obey's the gas laws at all conditions of temperature and pressure is called:

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Perfect gas

Super gas

Ideal gas

Real gas

Which is not a calcareous material:

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Lime

Marble

Clay

Marine shel

What will be the pH of 1.0 mol dm-3 of NH4OH, which is 1% dissociated

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2

12

0

2.7

In homocyclic compounds the ring consists of

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Carbon and oxygen atoms

Carbon and nitrogen atoms

Only carbon atoms

Carbon atoms with one hetero atom

Which compound is obtained hy the elimination reaction on bromoethane?

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Butene

Ethene

Propene

Propane

Alkyne is :

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CH_3-CH₃

CH₄

CH₂₌CH₂

C₂H₂

Source of organic compounds primarily is:

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Plants

Animals

Minerals

A & B

Which of the following groups will increase the acidity of phenol?

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-NO₂

-CN

-X (halogens)

All

Alkyle halides can be prepared by treating halogen acids with

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Ethane

Ethanol

Ethene and ethanol

Aldehyde

In sixth period 14 of its transition elements are called

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Lanthanides

Actinides

Radioactive elements

None

A set of compounds in which reactivity of halogen atom in the ascending order is

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Chlorobenzene, vinyl chloride, chloroethane

Chloroethane, chlorobenzene, vinyl chloride

Vinyl chloride,chlorobenzene chloroethane

Vinyl chloride, chloroethane,chlorobenzene

Fe can displace Cu form CuSO4solution because

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Fe is ferromagnetic

Fe is below Cu in electrochemical series

Fe is above Cu in electrochemical series

Fe exists in divalent oxidation state

It is common observation that rates of chemical reactions differ :

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Greatly.

A little bit.

Moderately.

The total number of rare earth elements is

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8

32

14

10

______ is used in breathing equipments for mountaineers and in space craft

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Li₂O

BeO

N₂

KO₂

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