Question # 1

Heat of neutralization of weak acid and a strong base is

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13.7 Kcal

Less than 13.7 Kcal

Greater than 13.7 Kcal

None of these

The number of elements in the 4th periods of periodic table is

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8

10

18

32

The heat contents of all the elements in their standard states are taken to be

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1

2

0

None

10g Of NaOH Has Been Dissolved Perdm³of solution. The morality of solution is :

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0.025 M

1.5 M

0.1 M

.25 M

In a Galvanic cell

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Chemical energy is converted into electricity

Chemical energy is converted into heat

Electrical energy is converted into heat

Electrical energy is converted into chemical energy

In a period, melting points of elements

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Increases

Decreases

Remain constant

First increases then decreases

The energy of ionization of an atom is the energy difference between orbital

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Series starting from57La,42Hf -80Hg is in the period:

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4th

5th

6th

7th

Carbon atom holding halogen in aryl halides is

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sp²-hybridesed

sp³-hybridesed

sp-hybridesed

sp³d-hybridesed

Nylon 6, 6 is prepared by the reaction of nexamethylene with

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Formic acid

Acetic acid

Adipic acid

None of these

In water the most important oxidizing agent is dissolved molecular oxygen which ranges from

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2 - 4 ppm

4 - 6 ppm

2 - 5 ppm

4 - 8 ppm

Internal energy of a system is equal to

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Kinetic energy of particles

Potential energy due to binding forces between particles

Sum of kinetic energy plus potential energy of the particles

Heat contents

The reactivity order of alkyl halides for a particular alkyl group is:

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F >Cl>Br>I

Cl>Br>F>l

l>Br>Cl>F

Br>l>Cl>F

Which one is used as a fuel for internal combustion engines in many European countries and Brazil

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C₂H₅OH

CH₃OH

CH₃COOH

C₂H₂

In the ground state of an atom the electron is present

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In the nucleus

In the second shell

Nearest to the nucleus

Farthest from the nucleus

Which of the following phosphorus is most reactive?

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Red phosphorus

White phosphorus

Scrlet phosphorus

Violet phosphorous

Which of the following statements is not true?

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Isotopes with even atomic masses are comparatively abundant

Isotopes with even atomic masses and even atomic numbers are comparatively abundant

Isotopes with even atomic masses and odd atomic number are comparatively abundant

Which is not interstitial hydride

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LaH

VH

TaH

None

Toluene is also called

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Hydroxyl benzene

Methyl benzene

ethyl benzene

None

Carbon monoxide is harmful to human beings as it

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Is carcinogenic

Is antagonistic to CO₂

Has higher affinity for hemoglobin as compared to oxygen

Is destructive to O₃

The freezing point of 1 molal NaCl solution assuming NaCl to be 100% dissociated in water in

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-1.86°C

-3.72°C

+1.86°C

+3.72°C

Which the increase in carbon number of solubility of an alcohol

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Increases

Decreases

Remains unaffected

None of these

The valency of noble gases, in general, is

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Zero

One

Three

Two

The rate at which a substance reacts is directly proportional to its active mass and the rate of reaction is directly proportional to the product of the active masses of reacting substances, is called

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Law of conservation of energy

Le-Chateliers principle

Law of mass action

None of these

Which compound does not show hydrogen bonding with water

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CH₃OH

C₂H₅OH

CH₃- O - CH₃

C₆H₅OH

What are alloys

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A homogenous mixture of two or more elements

A homohenous mixture of metal and a non-metal

A homogenous mixture of two or more metals

None of the above

Peat before conversion to bituminous coal is converted to

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Lignite

Anthracite

Asphalt

None

The boiling point of an a zeotropic mixture of water and ethye alcohol is less than that of water and alcohol. The mixture shows

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That solution is highly saturated

No deviation from Raoult's law

Positive deviation from Raoult's law

Negative deviation from Raoult's law

Chief air pollutant which is likely to deplete ozone layer

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Sulphure dioxide

Carbon dioxide

Nitrogen oxides and chloro fluorocarbons

The gasoline having octane No. 100 has ______

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More knocking

Less knocking

No knocking

Only knocking

When fused PbBr₂is electrolyed then

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Bromine appears at cathode

Lead deposited at the cathode

Lead appears at the anode

None of these happens

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