Question # 1

The one atmospheric pressure of air in term of pound per square inches is

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101.325

1.01325

760

14.7

Which is the optimum temperature for the activity of enzyme

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20 - 35°C

10 - 15°C

55 - 70°C

35 - 55°C

Detergent greatly effects the

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Aquatic life

Modern life

Terrestrial life

Plants life

Ethene is produced from ethyl chloride by reacting with alcoholic KOH. The process is called

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Hydrogenation

Dehydrogenation

Dehydrohalogenation

Oxidation

Air pollution causes

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Acid rain

O₃ depletion

Green House Effect

All

Which of the following liquids have low vapour pressure at 25°C

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Water

Ethyl alcohol

Acetone

Diethyl ether

Meniscus is the shape of the surface of a liquid in a cylindrical container:

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meniscus may be convex

meniscus is concave

meniscus may be convex or concave depending upon the nature of metal

meniscus is plane

The diffusion of gasses at absolute zero will be:

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Slightly decrease

unchanged

Slightly increased

Zero

The dehydration of ethyl alcohol with concentrated H2SO4 at 140°C gives

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Ethene

Alcohol

Diethyl ether

Carboxylic acid

Which one of the following is not a component of environment

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Biosphere

Stratosphere

Hydrosphere

Lithosphere

Site of land for landfill is selected based upon.

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topography

location of ground

water table

All of these

The element with highest electron affinity among the halogen is

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F

Cl

Br

I

The Total coal resources of Pakistan are estimated to be

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184 billion

184 million tones

1.84 billion tounes

1.84 million tonnes

Which of the following is not a hydrocarbon

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Butane

Methyl benezene

Acetylene

Glucose

Sulphuric acid reacts with PCl₅to give

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Thionyl chloride

Sulphur monochloride

Sulphuryl chloride

Sulphur tetrachloride

The quantum number which determines the shape of the orbital is

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principal

azimuthal

magnetic

spin

Which of the following is the use of electrolysis?

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Eletrorefining

Electroplating

Both A and B

None of the above

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

Enzymes, in the living systems

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Provide energy

Provide immunity

Transport oxygen

Catalyze biochemical processes

The total number of transition elements is:

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10

14

40

50

The sample being analyzed is called :

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Electrolyte.

Substance.

Analyte.

All of above.

The saturated hydrocarbons usually end with suffix ______

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Ane

Ene

Yne

Oic

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