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What happens when group 14 elements reac...

What happens when group 14 elements react with oxygen and water ?

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(a) With oxgen : When heated in air they form their respective monoxides and dioxides .
ex : `" " Si + O_(2) overset (Delta) to Si O_(2) (s)`
`" " 2C +O_(2) overset (Delta) to 2CO(g)`
`" " C+O_(2) overset (Delta) to CO_(2) (g)`
(b ) With water : C, Si, Ge do not react with water . However tin reacts with steam to form stannic oxide liberating hydrogen gas . `Sn + underset ("steam") (2H_(2) O) overset (Delta) to SnO_(2)+2H_(2(g))`
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SUBHASH PUBLICATION-P-BLOCK ELEMENTS-Three mark questions and answers
  1. What is allotropy ? Mention about the allotropic forms of Pb, Ge , Si.

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  2. Write the anomalous behaviours of boron.

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  3. What happens when group 14 elements react with oxygen and water ?

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  4. How does silicon dioxide react with NaOH and HF ?

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  5. Discuss the basic unit and structure of silicates.

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  6. How does metallic character vary among group 14 elements ? How is it r...

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  7. Write a note on the structure of Fullerene. Mention any two of its app...

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  8. Explain the structure of graphite giving the reason for its softness a...

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  9. Explain the structure of diamond giving the reason for its harness as ...

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  10. Give is the difference in the structure of the following pair of comou...

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  11. Explain the formation of (i) water gas (ii) producer gas. Give their u...

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  12. What happens when CO(2) is passed through lime water (i) for a short ...

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  13. What is dry ice ? Why is it called so ? How to prepare a pure sample o...

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  14. What happens when ? (i) Quick lime is heated with coke ? (ii) Carbon m...

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  15. Give a comparative account of the chemistry of carbon and silicon with...

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  16. A certain salt X gives the following results (i) Its aqueous solution ...

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  17. (a ) Carbon dioxide is non -polar while water is polar. What conclusio...

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  18. A white crystalline solid A dissolves in water to give an alkaline sol...

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  19. Mention three important uses of borax.

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  20. What is allotropy ? Give examples of allotropes.

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