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

Question # 1

Which one is the formula of chloromethane.

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CH₂Cl₂

CCl₄

CHCl₃

CH₃Cl

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Question # 2

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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Question # 3

Which one of the following is polmerized to from benzene?

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ethane

ethene

methane

ethyne

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Question # 4

Which gas in produced during ripening of bnabanas.

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Methane

Ethene

Acetylene

Carbon dioxide

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Question # 5

Carbon black is used in the manufacture of.

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Dry cleaning

Shoe polishes.

Fertilizer

None of these

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Question # 6

Which one of the following is gas at room temperature:

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C2H6

C6H14

C6H6

C8H18

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Question # 7

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 # 8

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 # 9

Which is the substitution reaction in the following?

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Halogenation of alkenes

Halogenation of alkynes

Bromination of alkene

Halogenation of alkanes

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Question # 10

Dehydrohalogenation of vicinal-dihalides take place in the presence of.

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NaOH

KOH

NaCl

None of these

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Question # 11

The general formula of alkynes is

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C_nH_2n

C_nH_2n+2

C_nH_2n-2

C_n H_2n+1

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Question # 12

The order or reactivity of hydrogen halides with alkenes is.

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HI/Br

HBr > HI

HCl > HBr

HBr>HCl

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Question # 13

Ethylene glycol can be prepared with the reaction of KMnO₄ and _____

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CH = CH

CH₃ - CH₃

CH₃CH₂CH₃

CH₂= CH₃

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