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

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Question 1 of 20

Chemistry

1. Water cannot act as:

Bronsted base

Bronsted acid

Lewis acid

Lewis base

Question 1 of 20

Question 2 of 20

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

SiO₂

MgO

SO₂

Na₂O

Question 2 of 20

Question 3 of 20

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

Turn yellow

Turn red

Turn green

Remains unchanged

Question 3 of 20

Question 4 of 20

4. An aqueous solution of which compound is basic:

Ammonium nitrate

Calcium chloride

Potassium carbonate

Ammonium acetate

Question 4 of 20

Question 5 of 20

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

Copper oxide

Magnesium oxide

Calcium oxide

Iron oxide

Question 5 of 20

Question 6 of 20

6. Which of the following oxides is classified incorrectly:

Zinc oxide (ZnO) amphoteric

Carbon dioxide (CO₂) acidic

Carbon monoxide neutral

Lead oxide (PbO) basic

Question 6 of 20

Question 7 of 20

7. 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

7

5

14

Question 7 of 20

Question 8 of 20

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

Copper oxide

Sodium carbonate

Potasium chloride

Aqueous ammonia

Question 8 of 20

Question 9 of 20

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

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

It can only be formed from a weak acid

Question 9 of 20

Question 10 of 20

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

Loss of water and SO₂

Reaction with CO₂ in the air

Loss of water only

Loss of water, sulphur dioxide and oxygen

Question 10 of 20

Question 11 of 20

11. 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

Nitrogen

Argon

Carbon dioxide

Question 11 of 20

Question 12 of 20

12. 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 12 of 20

Question 13 of 20

13. An aqueous solution of ammonium chloride is:

Amphotric

Acidic

Basic

Neutral

Question 13 of 20

Question 14 of 20

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

MgSO₄

FeCl₂

CaCl₂

CuCl₂

Question 14 of 20

Question 15 of 20

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

MgSO₄

CuSO₄

AgNO₃

BaSO₄

Question 15 of 20

Question 16 of 20

16. pH of 0.01M HCl solution is:

2.0

10⁺²

10²

1.0

Question 16 of 20

Question 17 of 20

17. 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

H₂SO₄

NaCl

NH₃

Question 17 of 20

Question 18 of 20

18. 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

Acidic

Neutral

Basic

Question 18 of 20

Question 19 of 20

19. A strong acid:

Always contains oxygen

Always decomposes carbonates

Is always partially ionized when in solution

Is always fully ionized when in solution

Question 19 of 20

Question 20 of 20

20. If a liquid has a pH of 7.

It has boiling point of 100°C

It must be a solution

It must be neutral

It must be colourless

Question 20 of 20

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