Chemistry Acids Bases and Salts Mcqs Test Online Punjab Class 9th

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Question 1 of 20

Chemistry

1. Which one of the following oxides dissolves in water to form acidic solution:

MgO

SiO₂

Na₂O

SO₂

Question 1 of 20

Question 2 of 20

2. Which one of the following oxides react with aqueous NaOH to give a salt.

Iron oxide

Copper oxide

Magnesium oxide

Calcium oxide

Question 2 of 20

Question 3 of 20

3. Which statement about acids is not correct? An acid:

Gives off carbon dioxide form a carbonate

Contains oxygen

Contains hydrogen ions in solution

Has a pH of less than 7

Question 3 of 20

Question 4 of 20

4. An aqueous solution of ammonium chloride is:

Amphotric

Basic

Acidic

Neutral

Question 4 of 20

Question 5 of 20

5. When air is bubbled through pure water, the pH is lowered from 7.0 to 5.6, which gas in the air is responsible for this change

Carbon dioxide

Oxygen

Argon

Nitrogen

Question 5 of 20

Question 6 of 20

6. If 25cm³ of 1 mol.dm⁻³ nitric acid is added to 50cm³ of 0.5 potassium hydroxide solution, what would be the pH of the resulting solution:

7

14

5

9

Question 6 of 20

Question 7 of 20

7. If dry citric acid crystals are placed on dry litmus paper they will

Turn red

Turn green

Remains unchanged

Turn yellow

Question 7 of 20

Question 8 of 20

8. A strong acid:

Is always fully ionized when in solution

Always contains oxygen

Always decomposes carbonates

Is always partially ionized when in solution

Question 8 of 20

Question 9 of 20

9. Which one of the following salts cannot be prepared by a reaction between a dilute acid and a metal?

FeCl₂

CuCl₂

CaCl₂

MgSO₄

Question 9 of 20

Question 10 of 20

10. Which of the following oxides is classified incorrectly:

Zinc oxide (ZnO) amphoteric

Carbon monoxide neutral

Carbon dioxide (CO₂) acidic

Lead oxide (PbO) basic

Question 10 of 20

Question 11 of 20

11. Water cannot act as:

Bronsted acid

Bronsted base

Lewis acid

Lewis base

Question 11 of 20

Question 12 of 20

12. pH of 0.01M HCl solution is:

10⁺²

1.0

2.0

10²

Question 12 of 20

Question 13 of 20

13. A base is a substance which will neutralize an acid which of these substances is not a base:

Potasium chloride

Copper oxide

Aqueous ammonia

Sodium carbonate

Question 13 of 20

Question 14 of 20

14. If a liquid has a pH of 7.

It has boiling point of 100°C

It must be colourless

It must be a solution

It must be neutral

Question 14 of 20

Question 15 of 20

15. The oxide of a metal was found to react with HCl along aqueous NaOH solution. Which of the following is the best description of the oxide?

Basic

Neutral

Acidic

Amphoteric

Question 15 of 20

Question 16 of 20

16. Which one of the following statements must be true of an acid salt?

It is the only salt formed from a dibasic acid

It can only be formed from a weak acid

It contains hydrogen that is replaceable by a metal

It is the salt of a non-metal

Question 16 of 20

Question 17 of 20

17. An aqueous solution of which compound is basic:

Calcium chloride

Potassium carbonate

Ammonium nitrate

Ammonium acetate

Question 17 of 20

Question 18 of 20

18. One mole of each of the following compounds was dissolved in water to make One dm³ of solution. Which of the solution would have the lowest pH value?

H₂SO₄

CH₃COOH

NH₃

NaCl

Question 18 of 20

Question 19 of 20

19. Which salt could be obtained as the insoluble product of a reaction between a dilute acid and an aqueous salt?

CuSO₄

AgNO₃

MgSO₄

BaSO₄

Question 19 of 20

Question 20 of 20

20. When crystals of copper sulphate are heated, the colour changes from blue to white. This is caused by:

Loss of water and SO₂

Loss of water, sulphur dioxide and oxygen

Loss of water only

Reaction with CO₂ in the air

Question 20 of 20

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