Question # 1

How many % age of nitrogen present in air by volume?

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70%

75%

78%

80%

The number of carbon atoms present in diesel oil.

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10-15

11-15

12-15

13-15

Which one of the ore of copper?

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Copper glance

Chalcopyrite

Both a and b

None of these

Concentration of copper are is carried out by process.

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Roasting

Forth floatation

Gravity sepration

Electrostatic separation

Matte is a mixture of:

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FeS and CuS

Cu₂O and FeO

Cu₂S and FeS

CuS and FeO

Blonde hair contains compounds of:

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molybdenum

iron

titanium

copper

The process of removal of gangue form the ore is technically known as:

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concentration

purification process

metallurgy

refining

Manufacturing of urea involves:

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2 steps

3 steps

4 steps

5 steps

Which one of the following organic compound is found is gasoline?

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C₂H₄

C₃H₈

C₇H₁₀

C₁₂H₂₆

Crude oil is heated to the fractionating furnace upto.

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300 ^oC

350^oC

400^oC

450^oC

Which one of the following is not a fraction of petroleum?

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Kerosene oil

Diesel oil

Alcohol

Petrol

The number of carbon atoms present in petroleum ether.

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1-5

2-5

3-7

5-7

A saturated solution of sodium chloride is called.

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Brine

Suspension

Colloidal

None of these

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