Question # 1

Urea is nitrogenous fertilizer. It consist of nitrogen.

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26.6 %

36.6%

46.6%

56.6%

the chemical formula of chalcopyrite is:

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Cu₂S

CuFe₂S

CuS

FeS

When NaHCO₃is heated if forms:

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CO₂

Ca(OH)₂

CaCO₃

CaO

Blast furnace usually used for the metallurgy of.

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Iron

Copper

Aluminum

Both a and b

Composition of carbon in the diesel oil.

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C₇-C₁₀

C₁₀-C₁₂

C₁₃-C₁₅

C₁₅-C₁₈

Formula of Urea is.

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KCNO

H₂N-CO-NH₂

HN-CO₂-NH

H₃N-CO-NH₃

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

Froth flotation process is used to concentrate the ore on:

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Density basis

Concentration basis

Wetting basis

Magnetic basis

In forth flotation process the ore particles are preferentially wetted by:

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water

oil

benzene

petrole

How many % age of nitrogen in urea fertilizers?

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40.6

45.6

46.6

50

When CO₂ is passed through the ammonical brine the only salt that precipitates is:

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NaHCO₃

NH₄HCO₃

Na₂CO₃

(NH₄)₂CO₃

Imperial chemical industries was established in.

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1942

1944

1950

1990

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