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

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Question 1 of 20

Chemistry

1. 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 1 of 20

Question 2 of 20

2. An aqueous solution of which compound is basic:

Ammonium acetate

Potassium carbonate

Ammonium nitrate

Calcium chloride

Question 2 of 20

Question 3 of 20

3. pH of 0.01M HCl solution is:

10⁺²

10²

1.0

2.0

Question 3 of 20

Question 4 of 20

4. A strong acid:

Always decomposes carbonates

Always contains oxygen

Is always fully ionized when in solution

Is always partially ionized when in solution

Question 4 of 20

Question 5 of 20

5. 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?

Acidic

Basic

Amphoteric

Neutral

Question 5 of 20

Question 6 of 20

6. Which of the following oxides is classified incorrectly:

Carbon monoxide neutral

Zinc oxide (ZnO) amphoteric

Lead oxide (PbO) basic

Carbon dioxide (CO₂) acidic

Question 6 of 20

Question 7 of 20

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

Turn green

Turn red

Remains unchanged

Turn yellow

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?

FeCl₂

MgSO₄

CuCl₂

CaCl₂

Question 8 of 20

Question 9 of 20

9. 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:

9

14

7

5

Question 9 of 20

Question 10 of 20

10. 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

NaCl

NH₃

Question 10 of 20

Question 11 of 20

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

Has a pH of less than 7

Gives off carbon dioxide form a carbonate

Contains oxygen

Contains hydrogen ions in solution

Question 11 of 20

Question 12 of 20

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

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

It contains hydrogen that is replaceable by a metal

Question 12 of 20

Question 13 of 20

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

MgSO₄

BaSO₄

CuSO₄

AgNO₃

Question 13 of 20

Question 14 of 20

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

Magnesium oxide

Copper oxide

Iron oxide

Calcium oxide

Question 14 of 20

Question 15 of 20

15. Water cannot act as:

Lewis base

Lewis acid

Bronsted base

Bronsted acid

Question 15 of 20

Question 16 of 20

16. An aqueous solution of ammonium chloride is:

Basic

Acidic

Amphotric

Neutral

Question 16 of 20

Question 17 of 20

17. 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 17 of 20

Question 18 of 20

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

Na₂O

SiO₂

SO₂

MgO

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

Argon

Carbon dioxide

Nitrogen

Oxygen

Question 19 of 20

Question 20 of 20

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

Aqueous ammonia

Copper oxide

Sodium carbonate

Potasium chloride

Question 20 of 20

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