Question # 1

A substance which can behave as an acid as well as a base is called.

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Acid

Base

Amphoteric

Neutral

At which temperature o water shows mxamimum density.

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0 ^oC

100^oC

4^oC

-4^oC

Traces of acetylene are present in coal gas about.

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0.06 %

0.08%

1.1%

90%

Chemical formula of copper glance is:

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Cu2O

Cu2S

CuFeS2

CuSO4

Coal is blackish complex mixture of compounds of

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Carbon

Hydrogen

oxygen

All

Ozone id beneficial for us as it:

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absorbs infrared radiations

absorbs ultraviolet radiation

absorbs chlorofluorocarbons

absorbs air pollutants

Oxidation of Ethene with KMnO₄ produces.

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Oxalic acid

Glyoxal

Ethene Glycol

Propene glycol

Dichloromethane reacts with halogens in the presence of diffused sun light and produces

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Carbon tetrachloride

Chloroform

Chloromethane

No reaction

75% atmosphere mass lies in how many kilometers.

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11 km

30 km

50 km

85 km

Which one of the following is not an air pollutants?

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Nitrogen

Carbon dioxide

Nitrogen oxide

Ozone

Boiling point of alcohol in centigrade is.

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68

78

118

128

Ethylene is present is natural gas sometimes to the extent of .

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10%

20%

30%

40%

Temporary hardness is because of .

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Ca(HCO₃)₂

CaCO₃

MgCO₃

MgSO₄

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