Page 223 - ICSE Chemistry 8

Observa on:
The nickel chloride solu on turns pink with the evolu on of a colourless gas. The bluish par cles of
copper metal are formed in the test tube.
This shows that copper oxide consis ng of carbon reduces copper(II) oxide to copper metal and carbon
dioxide gas is evolved.

CuO + C Cu + CO

C. Answer in detail.

1. Write a note on the occurrence of carbon.
2. Write the chemical proper es of carbon.
3. Write a note on the crystalline forms of carbon.

4. List the proper es of diamond.
5. Write the proper es and uses of buckminsterfullerene.
6. Write the uses of wood charcoal.
7. With the help of an ac vity, show that charcoal is a good reducing agent.

8. How is coal formed? Write the uses of coal. Explain destruc ve dis lla on of coal.
9. How is carbon dioxide prepared? Write the tests performed to test the presence of carbon dioxide.

10. Write the uses of carbon dioxide.
11. What is greenhouse eff ect?
12. What is global warming? What are the eff ects of global warming?
13. Discuss the causes of increased concentra on of carbon dioxide in atmosphere. Write the measures
to balance the concentra on of carbon dioxide in the atmosphere.
14. Write the proper es of carbon monoxide. How is carbon monoxide poisoning caused? What
precau ons should be taken to avoid carbon monoxide poisoning?

15. How is carbon monoxide added to the atmosphere?

OBSERVE AND PERFORM

Observe the given image carefully and answer the following ques ons.

1. What is shown in the given image?

2. Name the four varie es of coal.
3. Diff eren ate between peat and lignite.

4. How is the carbon content of coal related to its calorifi c value?

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