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Chemistry 10th Class English Medium Unit 16 Online Test MCQs With Answers

Question # 1

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

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concentration

purification process

metallurgy

refining

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Question # 2

the chemical formula of chalcopyrite is:

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Cu₂S

CuFe₂S

CuS

FeS

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Question # 3

Sodium carbonate is manufactured by.

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Haber's process

Ostwald's process

Solvay's process

All

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Question # 4

Which contains sufficient amount of metal?

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Mineral

Ores

Rocks

Soil

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Question # 5

The number of carbon atoms present in fuel oil.

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14-18

15-18

16-18

17-18

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Question # 6

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

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C₂H₄

C₃H₈

C₇H₁₀

C₁₂H₂₆

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Question # 7

Process of heating the concentrated ore to high temperature in excess of air is called.

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Roasting

Smelting

Bessemerization

All

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Question # 8

Which one of the following is manufactured by Solvar's process:

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caustic soda

washing soda

urea

sulphuric acid

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Question # 9

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

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Question # 10

Urea is nitrogenous fertilizer. It consist of nitrogen.

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26.6 %

36.6%

46.6%

56.6%

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Question # 11

In smelting process a small amount of coke is required because:

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it is highly endothermic process

it is highly exothermic process

it is very fast process

it is very slow process

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Question # 12

When NaHCO₃ is heated it forms.

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CO₂

Ca(OH)₂

CaCO₃

CaO

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Question # 13

On which bases froth floatation process take place?

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Density bases

Concentration basis

Watting basis

None of these

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