Question # 1

The lives of aquatic plants and animals are indirectly related to concentration of dissolved ------ in water:

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hydrogen

oxygen

chlorine

nitrogen

Which disease is caused by polluted water.

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Cholera

Typhoid

Diarrhea

All of them

Which gas is not present in atmosphere?

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Nitrogen

Oxygen

Helium

Carbon dioxide

In a chemical reaction, the substance that combine are called.

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Reactant

Products

Mass

Material

Incomplete combustion of alkanes produces.

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Carbon dioxide only

Carbon monoxide only

Carbon monoxide and carbon black

Carbon dioxide and carbon black

Alkanes are produced in large amounts by cracking of

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Natural gas

Petroleum

Benzene

Xylol

Which one of the following gases is used to destroy harmful bacteria in water.

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Iodine

Chlorine

Fluorine

Bromine

In a Reversible Reaction if Qc = Kc then.

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Reaction is occuring in forward direction

Reaction is occuring in Reverse direction

Equilibrium has been allained

Reaction is not at equilibrium

How many units are in Pakistan for manufacturing of Urea.

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3

6

9

12

Freezing point of water is:

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-4°C

0°C

-36°C

-58°C

The chemical used in Clark's method is:

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CaO

slaked lime(Ca(OH)s)

washing soda

sodium zeolite

Which process is responsible for ascending of water in roots:

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evaporation

transpiration

condensation

capillary action

The ability of carbon atoms to form chains or ring called.

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Hydrogenation

Chlorination

Cantenation

Halogenation

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