Question # 1

A saturated solution of sodium chloride is called.

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Brine

Suspension

Colloidal

None of these

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

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NaHCO₃

NH₄HCO₃

Na₂CO₃

(NH₄)₂CO₃

The impurities associated with the minerals are known as:

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Metallurgy

Ores

Gangue

Compounds

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

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water

oil

benzene

petrole

Red hair contains compound of.

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Iron

copper

titanium

Molybdenum

Bister copper is pure about;

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70%

80%

90%

98%

How many % age of urea is used as fertilizers?

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80%

90%

95%

98%

In solvay's process slaked lime is used to:

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Prepare CO₂

Prepare quick lime

Recover ammonia

Form Na₂CO₃

Froth flotation process is used to concentrate the ore on:

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Density basis

Concentration basis

Wetting basis

Magnetic basis

When NaHCO₃is heated if forms:

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CO₂

Ca(OH)₂

CaCO₃

CaO

Chalco-pyite is an ore of:

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iron

aluminium

silver

copper

When copper pyrite (CuFeS2) is strongly heated in excess of airit converted into mixture of:

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Cu2S + Cu2O

Cu2O +FeS

Cu2S + FeS

FeO + SO2 + Cu2S

Chemical formula of copper glance is:

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Cu2O

Cu2S

CuFeS2

CuSO4

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