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Why does NH(3) form H-bond but PH(3) doe...

Why does `NH_(3)` form H-bond but `PH_(3)` does not?

Text Solution

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The electronegativity of N (3.0) is much higher than that of H (2.1). Therefore, N - H bond is quite polar, causing intermolecular H-bonding in `NH_(3)` as shown below.

On the other hand, the electronegativities of both P and H are equal (2.1). Therefore P - H bond is not polar. Hence, `PH_(3)` does not undergo H-bonding.
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CHHAYA PUBLICATION-P-BLOCK ELEMENTS-NCERT EXERCISE QUESTIONS
  1. Why does the reactivity of N differ from phosphorus?

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  2. Discuss trends in chemical reactivity of Gr-15 elements.

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  3. Why does NH(3) form H-bond but PH(3) does not?

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  4. How is nitrogen prepared in the laboratory? Write the chemical equatio...

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  5. How is ammonia manufactured industrially?

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  6. Illustrate how copper metal can give different products on reaction wi...

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

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  8. The HNH angle value is higher than HPH, HAsH and HSbH angles. Why? [Hi...

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

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  10. Explain: NH(3) is basic while BiH(3) is only feebly basic.

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  11. Nitrogen exists as diatomic molecule and phosphorus as P(4). Why?

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  12. Write main differences between the properties of white phosphorus and ...

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  13. Why does nitrogen show catenation properties less than phosphorus?

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  14. Give the disproportionation reaction of H(3)PO(3).

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  15. Can PCl(5) act as an oxidising as well as a reducing agent? Justify.

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  16. Justify the placement of O, S, Se, Te and Po in the same group of the ...

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  17. Why is dioxygen a gas but sulphur a solid?

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  18. Knowing the electron gain enthalpy values for O to O^(-) and OtoO^(2-)...

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  19. Which aerosols deplete ozone?

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  20. Describe manufacture of H(2)SO(4) by contact process.

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