Question # 1

Which one of the following compounds does not exist?

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NCl₅

AsF₅

SbCl₅

PF₅

Octane number can be changed by

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Isomerisation

alkylation

Cyclisation

All of these

Which of the following has least mass?

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2 gram atom of nitrogen

3 x 10²³atoms of C

1 mole of S

7.0 g of Ag.

Hypo is used to photography for

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Developing picture

Picture printed

The colour of picture

The fixation of picture

2 g of oxygen contains number of atoms equal to that in

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0.5 g of hydrogen

4 g of sulphur

7 g of nitrogen

2.3 g of sodium

Phosphide ion has the electronic structure similar to that of

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Nitride ion

Fluoride ion

Sodium ion

Chloride ion

Which of the following statement regarding catalyst is not true?

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A catalyst remains unchanged in composition and quantity at the end of the reaction

A catalyst can initiate a reaction

A catalyst dose not alter the equilibrium in a reversible reaction

Catalysts are sometimes very specific in respect of reaction.

Magnesium keeps on burning in

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N₂

CO₂

N₂O

N₂as well as CO₂

Octane number is zero for

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n-Heptane

Isooctane

n-Hexane

Isoheptane

Among alkali metal salts, the lithium salts are the poorest conductors of electricity in aqueous solution because of

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Easy diffusion of Li⁺ions

Lower ability of Li⁺ions to polarize water molecules

Lowest charge to radius ratio

Higher degree of hydration of Li⁺ions

The most reactive compound for electrophilic nitration will be

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Benzyl chloride

Benzoic acid

Nitrobenzene

Chlorobenzene

The main structure features of proteins is

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An ester linkage

An ether linkage

The peptide linkage

All

According to MO theory, the species O⁺₂

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Bond order of 2.5

Three unpaired electrons

Diamagnetic character

Stability lower then O₂

Which of the following as a molecular diseaes?

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Allergy

Cancer

German measles

Sickle cell anemia

Chile salt petre is

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NaNO₃

Na₂SO4

KNO₃

Na₂S₂O₃

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

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Urea

Ammonium nitrate

Ammonium Sulphate

Ammonium chloride

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