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How does carbon occur in nature ?...

How does carbon occur in nature ?

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ICSE-SOME P-BLOCK ELEMENTS -SHORT ANSWER TYPE QUESTIONS
  1. Why does borax swell up on heating?

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  2. How would you prepare borax from colemanite

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  3. How does carbon occur in nature ?

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  4. Name three crystalline allotropes of carbon.

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  5. What is the hybrid state of carbon in ethyne, graphite and diamond ?

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  6. which of the following is not true about structure of diamond and grap...

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  7. Why is diamond resistant to most of the reagents ?

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  8. Graphite is anisotropic with respect to conduction of electric current...

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  9. Explain why graphite is soft and can be used as a lubricant.

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  10. Explain, why diamond is very hard but graphite is soft .

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  11. How will you account for the following: Graphite is soft and is used...

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  12. Write a short note on the amorphous forms of carbon.

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  13. What happens when carbon is treated with hot and conc. H2 SO4

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  14. Give a brief account of the reducing properties of carbon.

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  15. Why is carbon monoxide regarded as a treacherous poison ?

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  16. What happens when steam is passed over red hot coke .

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  17. What happens when sodium formate is heated with conc. H2 SO4

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  18. What happens when carbon monoxide is passed over nickel heated to 325-...

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  19. What happens when carbon dioxide is passed through lime water?

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  20. What is the role of CO2 in the synthesis of carbohydrates in plants?

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