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

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Question 1 of 20

Chemistry

1. Which of the following oxides is classified incorrectly:

Carbon dioxide (CO₂) acidic

Carbon monoxide neutral

Lead oxide (PbO) basic

Zinc oxide (ZnO) amphoteric

Question 1 of 20

Question 2 of 20

2. A strong acid:

Is always partially ionized when in solution

Always decomposes carbonates

Always contains oxygen

Is always fully ionized when in solution

Question 2 of 20

Question 3 of 20

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

Contains oxygen

Gives off carbon dioxide form a carbonate

Has a pH of less than 7

Contains hydrogen ions in solution

Question 3 of 20

Question 4 of 20

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

CaCl₂

CuCl₂

MgSO₄

FeCl₂

Question 4 of 20

Question 5 of 20

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

CuSO₄

MgSO₄

AgNO₃

BaSO₄

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:

14

9

5

7

Question 6 of 20

Question 7 of 20

7. 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?

Amphoteric

Neutral

Acidic

Basic

Question 7 of 20

Question 8 of 20

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

Reaction with CO₂ in the air

Loss of water, sulphur dioxide and oxygen

Loss of water only

Loss of water and SO₂

Question 8 of 20

Question 9 of 20

9. Water cannot act as:

Lewis base

Bronsted base

Bronsted acid

Lewis acid

Question 9 of 20

Question 10 of 20

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

It can only be formed from a weak acid

It is the only salt formed from a dibasic acid

It is the salt of a non-metal

It contains hydrogen that is replaceable by a metal

Question 10 of 20

Question 11 of 20

11. pH of 0.01M HCl solution is:

10²

1.0

2.0

10⁺²

Question 11 of 20

Question 12 of 20

12. If a liquid has a pH of 7.

It must be neutral

It must be colourless

It must be a solution

It has boiling point of 100°C

Question 12 of 20

Question 13 of 20

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

Iron oxide

Copper oxide

Magnesium oxide

Calcium oxide

Question 13 of 20

Question 14 of 20

14. 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

Oxygen

Argon

Nitrogen

Carbon dioxide

Question 14 of 20

Question 15 of 20

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

SiO₂

MgO

Na₂O

SO₂

Question 15 of 20

Question 16 of 20

16. 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?

CH₃COOH

NaCl

H₂SO₄

NH₃

Question 16 of 20

Question 17 of 20

17. An aqueous solution of which compound is basic:

Calcium chloride

Ammonium acetate

Potassium carbonate

Ammonium nitrate

Question 17 of 20

Question 18 of 20

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

Remains unchanged

Turn green

Turn yellow

Turn red

Question 18 of 20

Question 19 of 20

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

Sodium carbonate

Copper oxide

Potasium chloride

Aqueous ammonia

Question 19 of 20

Question 20 of 20

20. An aqueous solution of ammonium chloride is:

Amphotric

Acidic

Neutral

Basic

Question 20 of 20

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