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(a) Why does PCl3 fume in moisture ? (...

(a) Why does `PCl_3` fume in moisture ?
(b) Are all the five bonds in `PCl_5` molecule equivalent ? Justify your answer.
( c) How do you account for the reducing behaviour of `H_3 PO_2` on the basic of its structure ?
(d) Give the disproportional reaction of `H_3PO_3`.

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`PCl_(5)` has a trigonal bipyramidal structure and the three equatorial P-Cl bonds are equivalent, while the two axial bonds are different and longer than equatorial bonds.
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(a) Why does PCl_3 fume in moisture ? (b) Are all the five bonds in PCl_5 molecule equivalent ? Justify your answer. ( c) How do you account for the reducing behavior of H_3 PO_2 on the basis of its structure ? (d) Give the disproportional reaction of H_3PO_3 .

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(a) (i) Why PCl_(5) gives fumes in moisture ? (ii) Why Interhalogens are more reactive than pure halogens ? (b) Draw the structures of the following : {:((i) PCl_(5), (ii)H_(2)S_(2)O_(8),(iii)XeF_(4)):}

NCERT ENGLISH-THE P-BLOCK ELEMENTS-EXERCISE
  1. (a) Why does PCl3 fume in moisture ? (b) Are all the five bonds in P...

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  2. Why are pentahalides more covalent than trihalides?

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  3. Why is BiH3 the strongest reducing agent amongst all the hydrides of g...

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  4. Why is N(2) less reactive at room temperature ?

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  5. Mention the conditions required to maximise the yield of ammonia.

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  6. How does ammonia react with a solution of Cu(2)^(+)?

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  7. What is the covalence of nitrogen in N2O5?

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  8. Bond angle in PH(4)^(+) is higher than that in PH(3).Why ?

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  9. (a)What happens when white phosphorus is heated with concentrated NaOH...

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  10. What happens when (A)PCl(5) is heated. (B)PCl(5) is reacted with h...

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  11. Write a balanced equation for the hydrolytic reaction of PCl5 in heavy...

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  12. What is the basicity of H(3)PO(4) ?

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  13. What happens when (A)PCl(5) is heated. (B)PCl(5) is reacted with h...

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  14. List the important sources of sulphur.

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  15. Write the order of thermal stability of the hydrides of group 16 eleme...

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  16. Why is H(2)O a liquid and H(2)S a gas?

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  17. Which of the following does not react with oxygen directly? Zn,Ti,Pt,F...

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  18. Complete the following reactions: (i) C(2) H(4) + O(2) to (ii)...

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  19. Why does O3 act as a powerful oxidising agent?

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  20. How is O(3) estimated quantitatively ?

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  21. What happens when sulphur dioxide is passed through an aqueous solutio...

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