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

Question # 1

Some orchids attracts bees for pollination by producing.

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alkanes

almenes

alkynes

all the above.

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Question # 2

Marsh gas is mostly consisted of.

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Butane

Propane

Ethane

Methane

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Question # 3

Hydrogenation of vegetable oil to convert it into banaspatic ghee is carried out in the presence of catalyst:

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Ni-metal

Zn-metal

Na - Metal

Fe2O3

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Question # 4

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 # 5

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 # 6

How many percent of natural gas is consisted of methane.

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60%

70%

80%

85%

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Question # 7

Which is simplest alkane?

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CH₄

C₂H₈

C₂H₂

C₂H₄

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Question # 8

Which of one of the following is used as as fumigant:

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Ethyl alcohol

ethylene oxide

ethylene glycol

diethyl ether

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Question # 9

Which gas creates suffocation and causes death?

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CO₂

SO₃

SO₂

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Question # 10

The process which convert vegetable oil into banaspati ghee called.

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Hydrogenation

Halogenation

a and b

None of these

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Question # 11

General formula of alkynes is:

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C_nH_n

C_nH_2n

C_nH_2n+2

C_nH_2n-2

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Question # 12

Halogenation of methane on the presence of diffused sunlight takes place.

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Only in one step

Slowly in one step

Freshly in two steps

In a series of four steps

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