Question # 1

The surface tension of water is:

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very low

moderate

high

zero

Higher concentration of CO causes.

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Fatique

Headache

Both of them

None of them

Which pollutant is not found in car exhaust gases?

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CO

O₃

NO₂

SO₃

Water has a maximum density at .

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10^oC

0^oC

4^oC

100^oC

Carbon monoxide is harmful to us because.

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It paralyses the lungs.

It damages lungs tissues.

It reduces oxygen carrying ability of haemoglobin

It makes the blood coagulate.

Boiling point of water is:

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0^oC

25^oC

80^oC

100^oC

The number of carbon atoms present in petroleum ether.

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1-5

2-5

3-7

5-7

Which disease cause when humans use water of industrial effuents.

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Cancer

Asthma

Jaundica

Cholera

According to Lewis concept, acid is a substance which.

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Can donate protons

Can donate an electron pair

Can accept protone

Can accept electron pair

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

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CO₂

CO

N₂

O₃

The reaction in which the number of moles reactants and products not equal in balance chemical equation the units of Kc for this reactions are

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mol^-2

dm³

mol²

mol dm^-1

The gas use by plants to perform photosynthesis.

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O₂

CO₂

N₂

CO

There are ____________ types of salts.

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2

3

6

8

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