Question # 1

An endothermic reaction is one in which

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Heat is converted into electricity

Heat is obsorbed

Heat is evolved

Heat is converted into mechanical work

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 least mass?

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2 gram atom of nitrogen

3 x 10²³ atoms of C

1 mole of S

7.0 g of Ag.

Wholer prepared ures from

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Ammonia

NH₄CNO

NH₃

uric acid

Red lead is

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PbO

Pb₃O₄

PbO₂

Pb₄O₃

The dimension of rate constant of a second order reaction involves

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Neither time nor concentration

Only time

Time and concentration

Time and square of concentration

Carbon monoxide is pollutant as it

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Inactivates nerves

Inhibits glycolysis

Combines with oxygen

Combines with hemoglobin

Acetic anhydride is obtained form acetyl chloride by the reaction of

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P₂O₅

H₂SO₄

CH₃COONa

CH₃COCH₃

For most of the chemical reaction the rate of reaction

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Increases as the reaction proceeds

Decreases as the reaction proceeds

May increases or decreases during the reaction

Remains constant as the reaction

The relative rates of diffusion of a gas (Mol, wt. - 98) as compared to hydrogen will be

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1/7

1/5

1/4

1

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

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1

2

3

4

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