Question # 1

Temporary hardness is because of .

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Ca(HCO₃)₂

CaCO₃

MgCO₃

MgSO₄

Concentration of the copper ore is carried out by:

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Calcinations

Roasting

Forth flotation

Distillation

What gas is the major constituent of troposphere?

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Nitrogen

Oxygen

Hydrogen

Both a and b

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

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Carbon monoxide

Carbon dioxide

Hydrogen

Hydrogen chloride

Sodium carbonate is manufactured by.

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Haber's process

Ostwald's process

Solvay's process

All

Sum of PH and POH of a solution is:

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7

14

16

18

The dynamic equilibrium in irreversible reaction.

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Never establishes

Establishes after completion of reaction

Establishes before completion of reaction

Establishes very soon

Which one of the following is a fat soluble vitamin?

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A

E

K

All of these

How much amount of sunlight reaches up to earth and absorbed:

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26%

32%

50%

18%

Blonde hair contains compounds of:

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molybdenum

iron

titanium

copper

Which one of the following is gas at room temperature:

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C2H6

C6H14

C6H6

C8H18

These are safe source of food and energy for body during emergency.

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Proteins

Vitamins

Carbohydrats

Lipids

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

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10%

20%

30%

40%

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Chemistry 10th Class English Medium Online Test MCQs With Answers

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