Food, clothes, medicines, books, or many of the things. are all based on this versatile element carbon. In addition, all living structures are carbon based. The amount of carbon present in the earth’s crust and in the atmosphere is quite meagre. The earth’s crust has only 0.02% carbon. In spite of this small amount of carbon available in nature, the importance of carbon seems to be immense.
1. In what form, carbon is present in atmosphere?
(i) Nitrogen
(ii) Oxygen
(iii) Carbon dioxide
(iv) All of the above
2. What forms of carbon mineral is present in earth’s crust?
(i) Carbonates, hydrogen - carbonates
(ii) Coal and petroleum
(iii) All of the above
3. All the living things, plants and animals, are made up of carbon based compounds, which are called as_____.
(i) Organic compounds
(ii) Carbonic compounds
(iii) Inorganic compounds
(iv) None of these
4. State true or false : The materials like cotton, silk, wool, nylon which are used for making clothes are carbon compounds.
(i) TRUE
(ii) FALSE
5. State true or false : Most carbon compounds are good conductors of electricity.
(i) TRUE
(ii) FALSE
