Question # 1

An acid that exists as a cyclic dimer in benzene and shows a molar mass of 120g/mol is

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СН3СOOH

HCOOH

CI2CHCOOH

Сl3CCOOH

Super conductors are derived from compounds of

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P-block elements

Lanthanides

Actinides

Transition elements

Fine powder gypsum is mixed with clinker up to:

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4%

6%

5%

7%

The diffusion of gasses at absolute zero will be:

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Slightly decrease

unchanged

Slightly increased

Zero

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

Ground and surface waters are contaminated and become polluted due to the human activity. Which human activity will not cause water pollution

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live stock waste

agricultural pesticides

oil beaks and spills

all of the above

The one atmospheric pressure of air in term of pound per square inches is

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101.325

1.01325

760

14.7

Which of the following successive ionization energies belong to a Group ll element?

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320,600,1110,1700,5650,

577,1820,2740,1160,14800,

428,3070,4600,5860,7990

736,1451,7740,10500,13600

The enthalpy change AH of a process is given by the relation

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ΔΗ =ΔΕ + P∆V

ΔH=ΔE +W

ΔH =ΔΕ-ΔnRT

ΔΕ =ΔΗ + P∆V

In most of the cases the molecular crystals are

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very soft

soft

extremely hard

sufficiently hard

Vapour pressure of a liquid

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increasing with increase of temperature

increases with decrease of temperature

increases with size of container

increases with volume of liquid

Major component in cement is :

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SiO₂

Lime

Al₂O₃

MgO

Alkyl halides are reactive :

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High

Medium

Less

Least

Benzene was discovered by Michael Faraday's in

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1824

1825

1826

1827

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0.02

0.2

50

25

Effective magnetic moment of Sc³⁺ion is

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1.73

0

5.92

2.83

Phenol gives ---------- Colour with neutral FeCl₃solution

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Violet

Green

Red

Blue

The reaction of alcohol with SOCI₂in the presence of pyridine as catalyst gives

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Acids

Acid chloride

Alkyl halide

Benzene

Charge to mass ratio of electron was discovered by:

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Millika.

Rutherford.

J.J. Thomson.

Chadwick.

Down's cell is used to prepare

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Sodium carbonate

Sodium bicarbonate

Sodium metal

Sodium hydroxide

Ethyl bromide on treatment with alcoholic KOH gives

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Ethylene

Ethanol

Acetic Acid

Ethane

Incomplete oxidation of alkanes yields

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CO₂& carbon black

CO₂+ heat

CO and carbon black

CO + heat

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