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

Question # 1

Acid rain affects the aquatic life by clogging fish gills because of:

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Lead metal

Chromium metal

Mercury metal

Aluminium metal

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Question # 2

Which gas acts as a glass wall of a green house?

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Oxygen

Carbon dioxides

sulphur dioxide

Hydrogen

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Question # 3

What percentage of nitrogen and oxygen is in the atmosphere.

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69%

79%

89%

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Question # 4

Which of the following is a secondary pollutant.

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CO₂

SO₃

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Question # 5

Water is a;

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strong electrolyte

non-electrolyte

weak electrolyte

natural compound

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Question # 6

The heat capacity of water is greater than rocks.

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4 times

5 times

6 times

7 times

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Question # 7

Temporary hardness is because of .

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Ca(HCO₃)₂

CaCO₃

MgCO₃

MgSO₄

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Question # 8

In forth flotation process the ore particles are preferentially wetted by:

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water

oil

benzene

petrole

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Question # 9

Dilute acid react with carbonates the produce product except _________

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Salt

Water

Carbon di oxide

Hydrogen gases

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Question # 10

What is the pOH of Ca(OH)2, 0.02 M Solution.

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1.698

1.397

12.31

12.61

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Question # 11

Which one of the following organic compound is found is gasoline?

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C₂H₄

C₃H₈

C₇H₁₀

C₁₂H₂₆

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Question # 12

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 # 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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