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10th Class Chemistry English Medium KPK Boards Online Mcqs MCQs With Answers

Question # 1

Water molecule show structure.

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Tetrahedral

Trigonal

Pentagonal

All of them

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Question # 2

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 # 3

Alkyl radical is derivative of

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Alkane

Alkene

Alkyne

All

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Question # 4

The water of crystallization is responsible for the.

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Melting points of crystals

Boiling points of crystals

Shapes of crystals

Transition point of crystals

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Question # 5

The example of heterocyclic compound is.

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Benzene

Hexane

Cyclohexane

Pyridine

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Question # 6

Hydrogen atoms preset in pentane are.

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Question # 7

Which of the following gas is used to destroy harmful bacteria in water.

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Iodine

Chlorine

fluorine

Bromine

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Question # 8

Oxidation of alkenes forms:

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Glycol

Glyoxal

Formic acid

Oxalic acid

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Question # 9

Which gas is evolved when acids react with carbonates and bicarbonates?

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Carbon monoxide

Carbon dioxide

Hydrogen

Hydrogen chloride

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Question # 10

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 # 11

Carbon monoxide is harmful to use because it:

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Paralyses lungs

Damages lungs

Reduce oxygen carrying ability of hemoglobin

Make the blood coagulate

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Question # 12

Which compound do not produce in the halogenation of methane.

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Chloroform

Carbon tetrachloride

Carbon black

Chloromethane

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Question # 13

In the troposphere (lowest layer), the temperature decreases form 17°C to;

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-58°C

-93°C

-61°C

-49°C

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