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

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Question 1 of 20

Chemistry

1. 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

Acidic

Amphoteric

Neutral

Question 1 of 20

Question 2 of 20

2. 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 2 of 20

Question 3 of 20

3. 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

Argon

Nitrogen

Oxygen

Question 3 of 20

Question 4 of 20

4. An aqueous solution of ammonium chloride is:

Basic

Acidic

Amphotric

Neutral

Question 4 of 20

Question 5 of 20

5. If a liquid has a pH of 7.

It must be colourless

It has boiling point of 100°C

It must be a solution

It must be neutral

Question 5 of 20

Question 6 of 20

6. Water cannot act as:

Bronsted acid

Bronsted base

Lewis acid

Lewis base

Question 6 of 20

Question 7 of 20

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

SO₂

Na₂O

MgO

SiO₂

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:

Loss of water and SO₂

Reaction with CO₂ in the air

Loss of water only

Loss of water, sulphur dioxide and oxygen

Question 8 of 20

Question 9 of 20

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

Sodium carbonate

Potasium chloride

Aqueous ammonia

Copper oxide

Question 9 of 20

Question 10 of 20

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

CuCl₂

MgSO₄

CaCl₂

FeCl₂

Question 10 of 20

Question 11 of 20

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

Iron oxide

Copper oxide

Calcium oxide

Magnesium oxide

Question 11 of 20

Question 12 of 20

12. 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

7

9

5

Question 12 of 20

Question 13 of 20

13. 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

NH₃

CH₃COOH

NaCl

Question 13 of 20

Question 14 of 20

14. A strong acid:

Always decomposes carbonates

Is always partially ionized when in solution

Always contains oxygen

Is always fully ionized when in solution

Question 14 of 20

Question 15 of 20

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

Turn green

Turn red

Turn yellow

Remains unchanged

Question 15 of 20

Question 16 of 20

16. An aqueous solution of which compound is basic:

Ammonium acetate

Potassium carbonate

Ammonium nitrate

Calcium chloride

Question 16 of 20

Question 17 of 20

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

It contains hydrogen that is replaceable by a metal

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

Question 17 of 20

Question 18 of 20

18. pH of 0.01M HCl solution is:

10²

1.0

10⁺²

2.0

Question 18 of 20

Question 19 of 20

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

Contains hydrogen ions in solution

Contains oxygen

Has a pH of less than 7

Gives off carbon dioxide form a carbonate

Question 19 of 20

Question 20 of 20

20. Which of the following oxides is classified incorrectly:

Carbon monoxide neutral

Carbon dioxide (CO₂) acidic

Lead oxide (PbO) basic

Zinc oxide (ZnO) amphoteric

Question 20 of 20

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