Carbon and Its Compounds — Introduction

Grade 8 Science — Carbon and Its Compounds — Introduction: 25 practice questions with instant scoring and explanations.

1. How many allotropes of carbon are commonly known?
2. Which allotrope of carbon is the hardest natural substance?
3. Graphite is a good conductor of electricity because:
4. The structure of diamond consists of:
5. Fullerene is a form of carbon discovered in:
6. The most common form of fullerene is:
7. Carbon dioxide is produced in the atmosphere mainly due to:
8. Which property of carbon dioxide makes it suitable for fire extinguishers?
9. Carbon monoxide is a toxic gas produced when:
10. Carbon monoxide binds strongly with:
11. The carbon cycle involves the movement of carbon between:
12. In the carbon cycle, carbon enters the atmosphere mainly through:
13. Plants remove carbon dioxide from the atmosphere through the process of:
14. The chemical formula for carbon dioxide is:
15. Carbon is unique among elements because it:
16. The main source of carbon dioxide released into the atmosphere annually is:
17. Which of the following is a use of carbon dioxide?
18. The atmospheric concentration of carbon dioxide has increased due to:
19. Charcoal is produced by:
20. An important property of carbon is its:
21. Which of the following is an organic compound?
22. Carbon monoxide poisoning is dangerous because:
23. The structure of graphite allows it to be used as:
24. Diamond and graphite have different properties despite being made of carbon because:
25. The role of decomposers in the carbon cycle is to: