Question # 1

Permanent hardness can be removed by using .

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Soda lime

Sodium Zeolite

Quick lime

Lime water

Which one of the following is not a fraction of petroleum?

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Kerosene oil

Diesel oil

Alcohol

Petrol

When copper pyrite (CuFeS2) is strongly heated in excess of airit converted into mixture of:

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Cu2S + Cu2O

Cu2O +FeS

Cu2S + FeS

FeO + SO2 + Cu2S

Which gas saves the surface of earth from ultra violet radiation?

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CO₂

CO

N₂

O₃

Which one is homocyclic compound?

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Benzene

Cyclobutane

Cyclohexane

All

Water dissolves non-ionic compound by

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Ion-ion forces

Ion-dipole forces

Dipole -dipole forces

Hydrogen bonding.

The lives of aquatic plants and animals are indirectly related to concentration of dissolved gas in water.

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Nitrogen

Hydrogen

Oxygen

Carbon

Almost all air crafts fly in which reion?

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Troposphere

Stratosphere

Mesosphere

Thermosphere

In the bacterial decay, the compound of which element are emitted.

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Sulphur

Carbon

Nitrogen

All of them

A salt is not composed of

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A metallic cation

Non -metallic anion

an anion of a base

An anion of an acid

The end product of oxidation of acetylene is.

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Propen glycol

Ethan glycol

Glyoxal

Oxalic acid

The surface tension of water is:

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very low

moderate

high

zero

Normally rain water is weakly acidic because of.

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SO₃ gas.

CO₂gas.

SO₂gas.

NO₂gas.

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