Question # 1

All of the following substances are crystalline except:

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carbon

ice

plastic

sucrose

During the manufacturing process of cement the temperature of the decomposition zone goes up to

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600°C

800°C

1000°C

1200°C

The boiling point of glycerin at 1 atmospheric pressure is:

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290°C

390°C

190C°

210°C

The attractive forces which are created due to repulsion of electronic cloud of the molecules are

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dipole-dipole forces

ion dipole forces

instantaneous dipole-induced dipole forces

dipole-induced dipole forces

Consider the reaction

PCI5 (g) <---------> PCl3 (g) +Cl2 (g) in a closed container at equilibrium. At a fixed temperature, what will be the effect of adding more PCl5 on the equilibrium constant

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It increases

It remains unaffected

It decreases

Can't be predicted without Ki

Lactic acid is buffered by

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L. Carnosine

Glutathione

Casenogin

Dopa

Which one among the following is not a good leaving group

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HSO4-

CI-

OH-

Br-

All the Hydrolytic reactions are

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First order

Second order

Third order

pseudo-first order

Which is not a steroid

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Cholesterol

Ergosterol

Phospholipids

None of these

Which factor is helping to reduce the environmental pollution:

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urbanization

industrialization

increases of plantation

rapid growth of population

During thunderstorms, water dissolves

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Dust particles

HCl

Nitric acid

Clouds

The total number of rare earth elements is

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8

32

14

10

A nucleoside may be

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Ribonuleoside

Deoxyribonucleoside

Both a and b

None

The electronic configuration of an atom/ion can be defined by the following

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Aufbau principle

Pauli's exclusion principle

Hund's Rule

All the above

The unit of rate constant is the same as that of the rate of reaction in :

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First order reaction.

Second order reaction.

Zero order reaction.

Third order reaction.

Shahi Qilla may be destroyed by

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Flood in Ravi

Temperature mediated spoilage of marble

Air pollutants from Lahore chemical industries

All the above

In Dow's method, phenol can be made from

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Chlorobenzene

Benzene

Toluene

Benzene sulphonic acid

Which of the following is fully fluorinated polymer?

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Neoprene

Teflon

Thiokol

PVC

The term ebullioscopy is used for

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Depression of freezing point

Elevation in boiling point

Lower of vapour pressure

None of the above

Sulphur dioxide affects

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Cell wall

Plasmodesmata

All membrane systems

Nucleus

Closed chain compound can be classified into

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Homocyclic

Hetrocyclic

Aliphatic

Both a and b

The hydroxyl derivatives of aromatic hydrocarbons which have the -OH group directly bonded to the ring C-atom are called

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Alcohols

Ketones

Esters

Phenols

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