Question # 1

Ar has low critical temperature and pressure due to its

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small size

monatomic molecule

low polarizability

liquefaction temperature close to room temperature

Acetic acid is also named:

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Methanoic acid

Ethanoic acid

Propanoic acid

Butanoic acid

The volume of given mass of gas is directly proportional to absolute temperature when pressure is kept constant this is called

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Boyle's law

Charles's law

Graham's law

Dalton's law

Which pair of molecules have debye force

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Ne and Ne

Argon and water

Na⁺ion and water

Water and water

The phenomenon in which sudden expansion of a gas causes cooling is called

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evaporation

cooling

Joule Thomson effect

sublimation

NO and NO₂gases in atmosphere are represented by

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NO

NO₄

NO_x

N_xO_y

Type of polymer formed by the polymerization of two monomers is:

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homopolymer

copolymer

ter polymer

All of these

Which one of the following enzymes brings about the hydrolysis of fats

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Urease

Maltase

Zymase

Lypase

Which of these polymer is synthetic polymer

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Animal fat

Starch

Cellulose

Polyester

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

The solid particles posses only ______ kinetic energy

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Translational

Rotational

Viberational

Circular

Solubility of a substance in water decreases with rise in temperature except

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CaCI₂. 6H₂O

Pb(NO₃)₂

K₂Cr₂O₇

Ce₂(SO₄)₃

Which reaction is too vigorous to control

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Chlorination

Bromination

Iodination

Fluorination

On warming with silver powder,chloroform is converted into

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Acetylene

Hexachloroethane

1,1,2,2-tetrachloroethane

ethylene

Which of the following species participate in sulphonation of benzene ring?

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H2SO4

HSO4

SO3

SO^-₂

Most common oxidation states shownby cerium are

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+2, +4

+3, +4

+3, +5

+2, +3

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

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Doberiner arranged the similar elements into

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Pairs

Triads

Triplets

Rows

Sodium is never found free in nature because of its

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Chemical reactivity

Small ionic size

Small atomic volume

None of these

Which is not an essential amino acid

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Leucine

Methionine

Histidine

Lysine

The most commonly and widely used nitrogen fertilizer in Pakistan is

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Urea

Ammonium nitrate

Ammonium sulphate

Ammonium chloride

DDT is

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Biodegradable pollutant

Nondegradable pollutant

Not a pollutant

An antibiotic

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