Question # 1

Red lead is

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PbO

Pb₃O₄

PbO₂

Pb₄O₃

Which of the following value of ΔHf° represent that the product is least stable?

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-94.0 kcal mol^-1

-231.6 kcal mol^-1

+21.4 kcal mol^-1

+64.8 kcal mol^-1

Cheif air pollutant which is likely to deplete ozone layer

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Sulphure dioxide

Carbon dioxide

Nitrogen oxides and chloro fluorocarbons

Which of the following has greatest reducing power?

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HI

Hbr

HCI

HI

Which of the following has linear shape?

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SP

SP²

SP³

None of the above

The maximum number of electrons in a subshell for which / = 3 is

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14

10

8

4

When sulphur is boiled with Na₂SO₃solution the compound formed is

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Sodium sulphides

Sodium sulphates

Sodium persulphate

Sodium thiosulphate

Portland cement is manufactured by using

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Limestone,clay and sand

Limestone,gypsum and sand

Limestone,gypsum and alumina

Limestone,clay and gypsum

The number of unpaired electrons in the P-subshell of oxygen atom

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1

2

3

4

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