2025 First Term Examination On Chemistry for JSS 3

Welcome to your 2025 First Term Examination On Chemistry for JSS 3

1. Which of the following substances will turn blue litmus paper red?

2. A substance with a PH value of 13 is considered to be a :

3. Which of the following compounds is an example of an acidic salt?

4. Neutralization is the reaction between an acid and a base to form:

5. Which of the following substances is used in the manufacturing of soap and detergents?

6. A substance that changes colour in an acidic or basic medium is known as a/an

7. The salt Can(OH)Cl is a typical example of a

8. Which substance will taste sour and feel rough when touched?

9. What is the primary characteristic of an alkali?

10. The PH value of a substance formed from the reaction of a strong acid and a strong base will be approximately?

11. Which of the following is an example of a weak acid?

12. Which of the following metals is the most reactive among the options provided?

13. Which of these metals can displace hydrogen from dilute acids?

14. Complete the following displacement reaction Zn + CuSO4 >>

15. Arrange the following metals in decreasing order of reactivity: magnesium, potassium, Zinc, Copper

16. Which of these metals react vigorously with cold water?

17. Which gas is produced when a reactive metal reacts with a dilute acid?

18. What is the atomic number of Chlorine?

19. Which of the following best describes the physical appearance of Chlorine gas at room temperature?

20. The electronic configuration of Chlorine is ?

Subjectives

1..........is an example of mono basic substance

2..........is an example of inorganic acid

3. .........and 4.........are the types of acids

5.........and 6.........are the examples of an alkali

7. ........is a bleaching agent

8. .......is slippery to touch

9. ......and 10. ........are the apparati used in Titration

Essay Answer Only 4 Questions

1a. What is Basicity of an Acid? 1b. Mention 3 organic acids and their sources 1c. State 2 physical properties of an acid

2a. What is Reactivity Series? 2b. Differentiate between Most reactive and Least reactive metals. 2c. Use an equation to explain displacement reaction involving metals

3a. Define Salt. 3b. Differentiate between soluble and insoluble salts 3c. List and explain 2 types of salts

4a. What do you understand by the term"Hypo" 4b. State 3 uses of chlorine

5a. What is a Base? 5b. Explain PH meter 5c. Calculate the PH, if [H+] is 0.400M

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