Question # 1

A molecule in which sp²hybrid orbitals are used by the central atom in forming covalent bonds in

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He₂

SO₂

PCl₅

N₂

The limiting line of Blamer series in hydrogen spectrum lies in

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Visible regions

Ultraviolet region

Infrared region

x-rays region

Which of the following alkyl halides is used as a mathylating agent

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CH₂H₅l

CH₃l

C₂H₅Pr

C₂H₅Cl

Any substance under going physical or chemical change is said to be

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Surrounding

System

Losphere

Lithosphere

A solution has 92 g of ethyl alcohol, 96 g of methyl alcohol and 90 g of water. Mole percentage of ethyl alcohol in the solution is

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10

20

25

50

Which of the following is not affected by light

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Elimination Esterification

Elimination Isomerisation

Oxidation Exterification

Oxidation Oxidation

Which of the following mixture of liquids show negative deviation form Raults law

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Ethyl alcohol and ether

HCI and water

Phenol- water

Chlorobenene-bromobenene

Units of molarity are

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gm/lit

mol/lit

kg/lit

None of these

Pro stand for

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Valine

Alamine

Glycine

Proline

The movement of solvent molecules through a semipermeable membrane is called

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Electrolysis

Electrophoresis

Osmosis

Cataphoresis

Which of the following element is most reactive

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Li

Na

K

Cs

In the modern periodic table the elements are placed in the ascending order of their

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Atomic masses

Melting points

Boiling points

Atomic numbers

Bakelite is obtained from phenol by reacting with

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Acetaldehyde

Acetal

Formaldehyde

Chlorobenzene

According to Raoult's law

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Relative lowering of V.P. is equal to mole fraction of solute

The lowering of V.P. is directly proportional to mole fraction of solute

V.P. of solvent above solution is equal to product of V.P. of pure solvent and mole fraction of solvent ins solution

All of the above

Maximum hydrogen bonds in water are

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4

3

2

8

The total number of transition elements is:

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10

14

40

50

How many moles of hydrogen atoms does 3.2 g of methane, CH₄, contain?

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0.02

0.2

0.4

0.8

How many zones through which the charge passes in a rotary kiln

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4

3

2

5

Which one of the following gases is used for artificial ripening of fruits ?

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Ethane

Ethyne

Methane

Propane

Which one of the following is not an alkali metal

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Francium

Caesium

Rubidium

Radium

Which of the following does not give iodoform test?

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Ethanol

Ethanal

Acetophenone

Bezophenone

Rutherford's planetary like picture of the atomic modal was defective because

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It did not describe the quantity of positive charge

It did not explain the repulsion of protons within the nucleus

No empty space between nucleus and the electrons

Moving electron should radiate energy

The widely used nitrogen fertilizer that contains about 46% nitrogen is

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Ammonia

Ammonium nitrate

Ammonium sulphate

Urea

The rate constant k of a reaction activation energy Ea and temperature are related by Arrhenius in the form of an equation which is

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The bond order of individual C - C bond is benzene is

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One

Two

Between one and two

One and two alternately

The best electrode used in salt bridge is KCl. Which other electrolyte an also be used for the purpose :

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NaCl

NH₄NO₃

KNO₃

NaNO₃

Maximum freezing point falls in

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Camphor

Naphthalene

Benzene

Water

The total number of orbitals possible for the quantum number n is

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n

n²

2n

2n²

If we remove one hydrogen atom from an alkane we obtain a group called

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Acetyle group

Formyle group

Alkyle group

Ketyle group

Which reaction sequence would be best to prepare 3-chloro-aniline from benzene?

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Chlorination, nitration, reducing

Nitration, chlorination, reducition

Nitration, reduction,chlorination

Nitration, reduction, acylation, chlorination, hydrolysis

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