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Phosphine is technically used in Holme's...

Phosphine is technically used in Holme's signals. Substantiate. 

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Spontaneous combustion of phosphine is used in Holme.s signals. Tins containing calcium carbide and calcium phosphide are thrown in sea. Acetylene and phosphine gases are evolved, which will burn and serve as a signal.
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AAKASH SERIES-GROUP 15 ELEMENTS-EXERCISE - 1.2
  1. Phosphine is technically used in Holme's signals. Substantiate.

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  2. Discuss the structure and bonding in P(4) molecule.

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  3. What is allotropy ? Give the allotropes of oxygen.

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  4. Comment on the M-M bond strengths and catenation ability of group 15 e...

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  5. Elemental phosphorus is not diatomic like nitrogen. Explain.

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

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  7. Mention the oxidation numbers exhibited by nitrogen. Give an example f...

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  8. Nitrogen is trivalent, but phosphorus is pentavalent in its compounds....

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  9. PH(3) is stable in air, but catches fire when heated at 425K. Why?

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  10. Discuss the stability of hydrides of group 15 elements.

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  11. Write the trends in bond length, bond angle, and boiling points of MH(...

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  12. Nitrogen forms several oxides. Why?

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  13. Nitrous oxide supports combustion more vigorously than air. Why?

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  14. In case of phosphorus trihalides, bond angle increases from PF(3) to P...

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  15. NH(3) and NF(3) are both pyramidal. What observations are made on the ...

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  16. The correct order of bond angles is NO(2)^(+) gt NO(2) gt NO(2)^(-) . ...

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  17. Copper metal gives different products on reaction with nitric acid. Il...

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  18. Discuss the structure and basicity of orthophosphorus acid.

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  19. Draw the structures of -ous acids of phosphorus and discuss their redu...

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  20. What hapens when the following are heated? (a) orthophosphoric acid ...

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  21. Nitrogen behaves abnormally from the other elements of the same group....

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