MCQ Science Curiosity Chapter 8 Class 8 CBSE Board

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Nature of Matter: Elements, Compounds, and Mixtures

1. What does the term "pure" mean in science?

Question 1 of 20

2. Which of the following is a pure substance?

Question 2 of 20

3. What happens to water when it is cooled?

Question 3 of 20

4. What happens when electricity is passed through water in Activity 8.3?

Question 4 of 20

5. What are the substances formed in Activity 8.3 called?

Question 5 of 20

6. What are elements made up of?

Question 6 of 20

7. How are elements classified?

Question 7 of 20

8. Which element exists as a liquid at room temperature?

Question 8 of 20

9. How many elements are known at present?

Question 9 of 20

10. Which element is used in manufacturing mobile phone screens?

Question 10 of 20

11. Why can’t hydrogen and oxygen in water be separated by physical means?

Question 11 of 20

12. What is the ratio of hydrogen to oxygen atoms in water?

Question 12 of 20

13. What is sodium chloride made of?

Question 13 of 20

14. What happens when sugar is heated in Activity 8.4?

Question 14 of 20

15. What is Sample A in Activity 8.5?

Question 15 of 20

16. What is formed when Sample A is heated in Activity 8.5?

Question 16 of 20

17. What happens when a magnet is moved over Sample A?

Question 17 of 20

18. What gas is produced when Sample A reacts with dilute hydrochloric acid?

Question 18 of 20

19. What is the odor of the gas produced when Sample B reacts with dilute hydrochloric acid?

Question 19 of 20

20. What is the word equation for the reaction of Sample B with dilute hydrochloric acid?

Question 20 of 20


 

 

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