Question # 1

Catalyst used for ammonia synthesis is

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Cu

Co

Zn

Fe

The root mean square velocity of a gas is doubled when the temperature is

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reduced to half.

reduced to one-fourth

increased four times

inereased two times

Which of the compounds cannot show positional isomerism?

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Alkanes

Alkenes

Alkynes

Alcohols

The substance upon which an enzyme acts is known as its

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domain

field

substrate

reactant

Total heat content of a system is called

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Internal energy

Entropy

Enthalpy

All of these

The rate of diffusion of two gases are inverselly proportional to the square roots of their densities or molecular weights, is a statement of

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Charle's Law

Boyle's Law

Graham's Law

Dalton's Law

Which one of the following is water soluble vitamin?

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Niacin

Riboflavin

Trypsin

Ascorbic acid

Choose a point which is not included in the components of environment:

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stratosphere

hydrosphere

lithosphere

biosphere

The buffering property of proteins is due to the presence of

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Acidic and basic group

Hydrogen bonds

Indole group

Hyrophobic

The value of oxidation number of chlorine in HCIOs is

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+7

+5

-1

+3

Which method is not used in preparation of acetic acid?

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Oxidation of ethane

Hydrolysis of ethyl acetate

Reaction of CO₂with CH₃MgX

Oxidation of methane

For preparing an alkane, a concentrated aqueous solution of sodium or potassium salt of saturated carboxylic acid is subjected to

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Hydrolysis

Oxidation

Hydrogenation

Electrolysis

The free spaces between the metal atoms and its crystal lattice are called

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Valance spaces

Empty spaces

Interstices

None

The compound prepared by a substitution reaction of benzene is

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Acetophenone

Glyoxal

Cyclohexame

Hexabromo cyclohexane

At present cement plants in Pakistan are:

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Ten

Twenty Two

Four

Twenty Four

Solvent extraction is an unstable, Process and it is called by:

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The amount of solute

Distribution law

The amount of solvent used

Law of mass action

A transition element is defined as an element of 3d series

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Which is metal

Which has one stable ion

Which has two stable ions

Which has at least one stable ion with incomplete d-orbital

Bronze is an alloy which contains

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60% cu

70% cu

80% cu

99% cu

Ammonium carbonate when heated to 200°C gives a mixture of NH₃and CO₂vapour with a density of 13.0. What is the degree of dissociation of ammonia carbonate?

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3/2

1/2

2

1

Which of the following is not a colligative property?

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Depression in freezing point

Elevation of boiling point

Osmotic pressure

Modification of refractive index

Electron affinity of sulphur is

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More than O and Se

More than O but less than Se

Less than O but more than Se

Equal to O and Se

Ethyl alcohol may be identified by

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Ring test

Iodoform test

Tollen's test

Bazeyer's test

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