Question # 1

A clathrate may be defined as a

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Cage compound

Liquid crystal

Mixture

Solid solution

Which of these is the most widely used nitrogen fertilizer in Pakistan

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Urea

Ammonium nitrate

Ammonium Sulphate

Ammonium chloride

Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBH₄or LiAIH₄?

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1-Propanol

2-Propanol

2-Methyl-2-propanol

Ethanol

The order of reactivity of halogens in aliphatic substitution reactions is

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Br2 > C12 > F2

Cl2 > Br2 > F2

Cl2 C12 > Br2

F2 > Br2 > C12

Which of the following mineral does not contain Al?

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Cryolite

Mica

Feldspar

Fluorspar

Minamata disease is due to pollution of

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Organic waste

Oil spill in water

Industrial waste containing mercury into fishing water

Arsenic into the atmosphere

The relative rates of diffusion of a gas (molecular weight = 128) as compared to oxygen is

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2 times

1/4

1/8

1/2

Water (H_2O) is liquid while hydrogen sulphide (H₂S) is a gas because

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Water has higher molecular weight

Hydrogen sulphide is a weak acid

Sulphure has high electronegativity than oxygen

Water molecules associate through hydrogen

White lead is

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Basic lead acetate

Acidic lead carbonate

Basic lead carbonate

Basic lead hydroxide

Maximum number of active hydrogens

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Acetic acid

Glycerol

Methane

Methanol

Carbon atom holding halogen in aryl halides is

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sp²-hybridesed

sp³-hybridesed

sp-hybridesed

sp³d-hybridesed

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

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Chlorination, nitration, reduction

Nitration, Chlorination, reduction

Nitration, reduction, chlorination

Nitration, reduction, acylation, chorination, hydrolysis

Setting of Plaster of Paris involves

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Oxidation with atmospheric

Combination with atmospheric CO₂

Dehydration

Hydration to yield another hydrate

The main structure features of proteins is

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An ester linkage

An ether linkage

The peptide linkage

All

Which of the following with aqueous KOH will give acetaldehyde?

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1, 2-Dichloroethane

1, 1-Dichloroethane

Chloroacetic acid

Ethyl chloride

Which of the following is monoatomic?

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Oxygen

Neon

Fluorine

Nitrogen.

Bleaching action of bleaching powder is due to the liberation of

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O₂

OCl^-

Cl₂

Cl^-

When KClO₃is heated, it decomposes into KCl and O_{2. If some MnO2 is added, the reaction goes much faster because}

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MnO₂decomposes to give O₂

MnO₂provide heat by reacting

Better contact is provided by MnO₂

MnO₂acts as a catalyst.

The weight of 11.2 litres of CO₂at S.T.P. would be

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88 g

44 g

32 g

22 g

The digestion of fats in the intestines is aided by

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Diffusion

Protection

Peptization

Emulsification

When electrons revolve in stationary orbits,

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There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

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