Question # 1

Number of discovered element till today are.

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140

118

90

16

Bond energy of C-C is.

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200 KJmol^-1

452 KJmol^-1

300 KJmol^-1

355 KJmol^-1

Our planet earth consists of ____________ natural Spheres.

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1

4

6

8

Composition of carbon in the diesel oil.

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C₇-C₁₀

C₁₀-C₁₂

C₁₃-C₁₅

C₁₅-C₁₈

Potassium Ferrocyanide is a:

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Normal salt

Mixed salt

Complex salt

Double salt

Traces of acetylene are present to coal gas about.

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0.06 %

0.08%

1.1 %

90%

Normally rain water is weakly acidic because of.

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SO₃ gas.

CO₂gas.

SO₂gas.

NO₂gas.

Which pollutant is not found in car exhaust gases?

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CO

O₃

NO₂

SO₃

The process of removing temporary hardness of water.

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Clark's method

Washing soda method

Sodium zeolite

Filteration method

Stearic acid present in

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Apple

Fats

Urine

Grapes

What percentage of nitrogen and oxygen is in the atmosphere.

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69%

79%

9%

89%

Which of the following gas is used to destroy harmful bacteria in water.

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Iodine

Chlorine

fluorine

Bromine

Chemical formula for urea is:

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NH4CNO

NH4CH

NH2CONH2

NH4CI

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