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In the structure of HNO(3), why is N-O b...

In the structure of `HNO_(3)`, why is N-O bond (121 pm) shorter than N-OH bond (140 pm) ?

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`HNO_(3)` is a resonance hybrid of the following two canonical structures :

Due to resonance N-O bond has some double bond character. In contrast, N-OH has only pure single bond character. Since single bonds are longer than double bonds, therefore, N-OH bond is longer (140 pm) than N-O bond (121 pm) in `HNO_(3)`.
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Which of the following statement are true . (i) In the structure of HNO_3 , the N- O bond (121 pm) is shorter than the N-ON bond (140pm) . (ii) All the P - Cl bonds in PCl_5 are not equivalent . (iii) I - Cl is more reactive than I_2 .

Explain the following situations : (i) In the structure of HNO_(3) molecule , the N-O bond (121 pm) is shorter than N-OH bond (140pm). (ii) SF_(4) is easily hydrolysed whereas SF_(6) is not easily hydrolysed. (iii) XeF_(2) has a straight linear structure and not a bent angular structure.

Account for the following : (i) NH_(3) is a stronger base than PH_(3) (ii) Sulphur has a greater tendency for catention than oxygen. (iii) Bond dissociation energy of F_(2) is less than that of Cl_(2) . (OR) Explain the following situations : (i) In the structure of HNO_(3) moleucle, the N-O bond (121 pm) is shorter than the N-OH bond (140 pm). (ii) SF_(4) is easily hydrolysed whereas SF_(6) is not easily hydrolysed. (iii) XeF_(2) has a straight linear structure and not a bent angular structure.

(a) Write the resonance structure of RCOOH . (b) Why is (C-O) bond shorter in RCOOH than in ROH ( c) Compare the (C=O) bond length in RCOOH and RCHO . (d) Compare the reactivities of (C=O) in RCOOH and RCHO towards nucleophilic addition (N.A.) reactions.

Give reason for : (i) SF_6 is kinetically an inert substance. (ii) The N - O bond in N0_(2)^- is shorter than the N - O bond in NO_(3)^- .

PRADEEP-P-BLOCK ELEMENTS -CONCEPTUAL QUESTION
  1. Why is N(2)O(5) more acidic than N(2)O(3) ?

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  2. Give reasons for the following : (i) NO (Nitric oxide) is paramagnet...

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  3. In the structure of HNO(3), why is N-O bond (121 pm) shorter than N-OH...

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  4. Compound that acts as oxidant as well as reductant

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  5. Why is red phosphorus less reactive than white phosphorus ?

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  6. PCl(5) is ionic in nature in the solid state. Give reasons. Or Solid...

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  7. Draw the structure of PCl(5). Or Solid PCl(5) is ionic in nature.

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  8. Give chemical reaction in support of the statement that all the bonds ...

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  9. H(3)PO(3) is diprotic (or dibasic). Why ? Or What is the basicity of...

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  10. The electron gain enthalpy with negative sign for oxygen (− 141 KJ mol...

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  11. Why the compounds of fluorine with oxygen are called fluorides of oxyg...

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  12. (a) Sulphur has greater tendency for catenation than oxygen. Give reas...

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  13. Large difference between the melting and boiling points of oxygen and ...

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  14. SO(2) is reducing while TeO(2) is an oxidising agent. Give reasons.

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  15. SF(6) is known but SH(6) is not known. Explain.

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  16. SF(6) is known but SC(6) is not. Why?

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  17. H(2)S acts only as a reducing agent while SO(2) acts as an oxidising a...

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  18. H(2)S is a stronger acid than H(2)O. Explain

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  19. Give reasons for the following observations : Why SF(4) undergoes hy...

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  20. All the bonds in SF(4) are not equivalent. Why ?

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