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Chemistry 10th Class English Medium Unit 12 Online Test MCQs With Answers

Question # 1

Alkanes are produced in large amounts by cracking of

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Natural gas

Petroleum

Benzene

Xylol

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Question # 2

____________ use for ripening of fruits.

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Ethene

Ethane

Ethyne

Propane

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Question # 3

One of the hydrocarbons reacts with one mole of hydrogen to form a saturated hydrocarbon. What is the formula could be of the x:

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C₃H₈

C₆H₁₂

C₄H₁₀

C₂H₁₆

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Question # 4

The order of reactivity of hydrogen halides with alkenes is.

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HI>HBr

HBr>HI

HCl>HBr

HBr < HCl

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Question # 5

Which one of the following is polmerized to from benzene?

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ethane

ethene

methane

ethyne

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Question # 6

Which gas creates suffocation and causes death?

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CO₂

SO₃

SO₂

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Question # 7

Ethylene is present is natural gas sometimes to the extent of .

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10%

20%

30%

40%

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Question # 8

Which of the following gas is used in warfare?

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Methane

Ethane gas

Mustard gas

None of these

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Question # 9

Molecular formula of butyne is .

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C₄H₆

C₃H₄

C₄H₇

C₄H₈

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Question # 10

Chloroform is used for

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Anesthesia

Fever

Link

Toys

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Question # 11

Dehydration means removal of.

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Water

Halogen

Hydrogen

All above.

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Question # 12

Halogenation of alkanes in the presence of diffused sunlight takes place.

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Suddenly, only in one step

Slowly in one step

In a series of step

Fastly in two steps

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Question # 13

Halogenation of methane produces following valuable chemical compounds used as solvents except.

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Carbonterachloride

Chloroform

Carbon Black

Chloromethane

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