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

Question # 1

Ammonical brine is prepared by dissolving ammonia gas in.

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NaCl

CaCO₃

CaCl₂

Na₂SO₄

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Question # 2

Formula of baking soda is.

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Na₂CO₃

NaHCO₃

Na₂SO₄

Na₂PO₄

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Question # 3

Which one is not the fraction of residual oil?

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Paraffin wax

Asphalt

Fuel oil

Coke

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Question # 4

Concentration of the copper ore is carried out by:

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Calcinations

Roasting

Forth flotation

Distillation

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Question # 5

The number of carbon atoms present in petroleum gas.

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1-2

1-3

1-4

1-5

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Question # 6

The nitrogen present in urea is used by plants to synthesize.

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Sugar

Proteins

Fats

DNA

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Question # 7

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 # 8

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 # 9

Which one of the following is not faction of crude oil.

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Paraffin wax

Asphalt

Fuel oil

Petroleum coke

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Question # 10

How many units are in Pakistan for manufacturing of Urea.

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Question # 11

When crude oil is heated in the fractionating tower:

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Vapour of higher boiling point fraction condense first in the lower part of the tower.

Vapours of lower boiling point fraction condense first in the lower part of tower.

Vapour of higher boiling point condense lather in the upper part of tower.

Vapours of higher boiling point never condense.

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Question # 12

A saturated solution of sodium chloride is called.

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Brine

Suspension

Colloidal

None of these

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