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How is alpha- black phosphorus prepared ...

How is `alpha`- black phosphorus prepared from red phosphorus ?

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`to alpha` - Black 'P' : It is formed when red 'P' is heated in a sealed tube 803K.
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-P-BLOCK ELEMENTS -GROUP 15 ELEMENTS (VERY SHORT ANSWER QUESTIONS)
  1. How do you account for the inert character of dinitrogen ?

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  2. Explain the difference in the structures of white and red phosphorus.

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  3. How is alpha- black phosphorus prepared from red phosphorus ?

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  4. Write the difference between the properties of white phosphorus and re...

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  5. What is inert pair effect ?

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  6. Explain why is NH(3) basic while "BiH"(3) is only feebly basic.

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  7. Arrange the hydrides of group - 15 elements in the increasing order of...

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  8. PH(3) is a weaker base than NH(3) - Explain.

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  9. A hydride of group -15 elements dissolves in water to form a bbasic so...

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  10. What happens when white phosphorus is heated with conc. NaOH solution ...

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  11. NH(3) forms hydrogen bonds but PH(3) does not - why ?

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  12. The HNH angle is higher than HPH, HAsH and HSbH angles - Why ?

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  13. How do calcium phosphide and heavy water react ?

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  14. Ammonia is a good complexing agent - Explain with an example.

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  15. A mixture of "Ca"(3)"P"(2) and "CaC"(2) is used in making Holme's sign...

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  16. Which chemical compound is formed in the brown ring test of nitrate io...

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  17. Give the resonating structures of NO(2) and N(2)O(5).

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  18. Why does R(3)P=O exist but R(3)B=O does not (R = alkyl group) ?

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  19. How is nitric oxide (NO) prepared ?

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  20. Give one example each of normal oxide and mixed oxide of nitrogen.

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