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

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Question 1 of 20

Chemistry

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

Loss of water, sulphur dioxide and oxygen

Loss of water and SO₂

Reaction with CO₂ in the air

Loss of water only

Question 1 of 20

Question 2 of 20

2. A strong acid:

Is always fully ionized when in solution

Is always partially ionized when in solution

Always contains oxygen

Always decomposes carbonates

Question 2 of 20

Question 3 of 20

3. pH of 0.01M HCl solution is:

2.0

10²

1.0

10⁺²

Question 3 of 20

Question 4 of 20

4. Which of the following oxides is classified incorrectly:

Lead oxide (PbO) basic

Zinc oxide (ZnO) amphoteric

Carbon monoxide neutral

Carbon dioxide (CO₂) acidic

Question 4 of 20

Question 5 of 20

5. 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?

NaCl

NH₃

CH₃COOH

H₂SO₄

Question 5 of 20

Question 6 of 20

6. If a liquid has a pH of 7.

It must be neutral

It must be a solution

It must be colourless

It has boiling point of 100°C

Question 6 of 20

Question 7 of 20

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

It contains hydrogen that is replaceable by a metal

It is the salt of a non-metal

It is the only salt formed from a dibasic acid

It can only be formed from a weak acid

Question 7 of 20

Question 8 of 20

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

CaCl₂

FeCl₂

MgSO₄

CuCl₂

Question 8 of 20

Question 9 of 20

9. 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 9 of 20

Question 10 of 20

10. An aqueous solution of ammonium chloride is:

Acidic

Basic

Amphotric

Neutral

Question 10 of 20

Question 11 of 20

11. An aqueous solution of which compound is basic:

Ammonium acetate

Calcium chloride

Ammonium nitrate

Potassium carbonate

Question 11 of 20

Question 12 of 20

12. Water cannot act as:

Bronsted base

Lewis acid

Lewis base

Bronsted acid

Question 12 of 20

Question 13 of 20

13. 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

9

5

14

Question 13 of 20

Question 14 of 20

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

Calcium oxide

Copper oxide

Magnesium oxide

Iron oxide

Question 14 of 20

Question 15 of 20

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

Turn green

Remains unchanged

Turn red

Turn yellow

Question 15 of 20

Question 16 of 20

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

Sodium carbonate

Copper oxide

Aqueous ammonia

Potasium chloride

Question 16 of 20

Question 17 of 20

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

Has a pH of less than 7

Contains oxygen

Gives off carbon dioxide form a carbonate

Contains hydrogen ions in solution

Question 17 of 20

Question 18 of 20

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

MgO

Na₂O

SO₂

SiO₂

Question 18 of 20

Question 19 of 20

19. 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

Nitrogen

Argon

Oxygen

Question 19 of 20

Question 20 of 20

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

AgNO₃

MgSO₄

CuSO₄

BaSO₄

Question 20 of 20

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