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

Question # 1

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 # 2

The reduction of alkyl halides takes place in the presence of.

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Zn/HCl

Na/HCl

Mg/HCl

Cu/HCl

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Question # 3

When bromine water is added to acetylene its red-brown colour is changed into:

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red

green

violet

discharged

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Question # 4

General formula of alkenes.

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C_n H_2n-2

C_nH_2n

C_nH_2n+2

C_nH_2n-1

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Question # 5

Ethyne is oxidized by alkaline KMnO₄ then ....... hydroxyl group add to the triple bond.

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Two

Three

Four

Five

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Question # 6

Which one is the formula of chloromethane.

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CH₂Cl₂

CCl₄

CHCl₃

CH₃Cl

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Question # 7

Which gas in produced during ripening of bnabanas.

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Methane

Ethene

Acetylene

Carbon dioxide

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Question # 8

Oxidation of ethene with KMnO₄produces.

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oxalic acid

glyoxal

ethene glycol

Propene glycol

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Question # 9

Which one of these hydrocarbon molecules would have no effect on an aqueous solution of bromine?

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CH₄

C₁₀H₂₀

C₂H₄

C₂H₂

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Question # 10

Condensed formula of ethane is

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C₃Cl₈

C₂Cl₆

H₃CCH₃

None of these

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Question # 11

How trace amount of acetylene present in the coat gas.

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0.06%

0.07%

0.08%

0.09%

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Question # 12

In which one of the following is a substitution reaction?

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Halogenations of alkynes

Halogenations of alkenes

Halogenations of alkanes

Bromination of alkenes

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Question # 13

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

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10%

20%

30%

40%

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