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The HNH angle value is higher than those...

The HNH angle value is higher than those of HPH, HAsH and HSbH angles , why ?

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`{:("Molecule" " ": NH_(3),PH_(3),AsH_(3),SbH_(3),BiH_(3)),("Bond angle" " ": 107*8^(@),93*6^(@),91*8^(@),91*3^(@),90^(@)):}`
The central atom (E ) in all the hydrides is `sp^(3)` hybridised. However, its electronegativity decreases and atomic size increases down the group. As a result, there is a gradual decrease in the force of repulsion in the shared electron pairs around the central atom. This leads to decrease in the bond angle.
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DINESH PUBLICATION-THE P-BLOCK ELEMENTS -N.C.E.R.T. Exercise
  1. Illustrate, how copper gives different products on reaction with HNO3.

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

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  3. The HNH angle value is higher than those of HPH, HAsH and HSbH angles ...

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

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  5. Explain why is NH(3) basic while PH(3)is feebly basic in nature.

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  6. Nitrogen exists as diatomic molecule (N(2)) while phosphorus as tetra-...

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  7. Write main differences between the properties of white phospghorus and...

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  8. Why does nitrogen show catenation properties less than prosphorus.

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  9. Give one disproportionation reaction of phosphorus acid (H(3)PO(3)).

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  10. Can PCl(5) act as oxidising as well as reducing agent ? Justify.

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

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

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  13. Knowing the electron gain enthalpy values for O to O^(-) " and " O to...

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  14. Which aerosols deplete ozone ?

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  15. The catalyst used in the manufacture of H(2)SO(4) by contact process i...

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  16. How is SO(2) an air pollutant ?

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  17. Why are halogens strong oxidising agents ?

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  18. Explain why does fluorine form only one oxoacid (HOF).

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  19. Explain why inspite of nearly the same electronegativity, nitrogen for...

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  20. Write two uses of ClO2.

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