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On being slowly passed through water, PH...

On being slowly passed through water, `PH_(3)` forms bubbles but `NH_(3)` dissolves. Why is it so ?

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N-H bond is more polar than P-H bond. Hence, `NH_(3)` forms hydrogen bonds with `H_(2)O` molecles and hence dissolves in it whereas `PH_(3)` does not dissolve and hence forms bubbles.
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PRADEEP-P-BLOCK ELEMENTS -VERY SHORT ANSWER QUESTIONS
  1. Why is white phosphorus kept under water ?

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  2. How will you obtain phosphine from phosphorus ?

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  3. On being slowly passed through water, PH(3) forms bubbles but NH(3) di...

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  4. Give the chemical equation for the reaction the occurs between iron an...

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  5. What happens when PCl(5) is heated ?

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  6. Why is PCl(5) more covalent than PCl(3) ?

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  7. Why does PCl(5) fume in moisture ?

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  8. Complete the following reactions : (i) P(4) + SOCl(2) rarr (ii) CH...

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  9. Suggest a method for the laboratory preparation of DCl. Write a balan...

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  10. What is the oxidation number of phosphorus in H(3)PO(2) molecule ?

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  11. What should be the order of acidic strength in the series H(3)PO(4), H...

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  12. Why does H(3)PO(3) act as a reducing agent but H(3)PO(4) does not ?

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  13. Why does orthophosphoric acid exist as a syrupy liquid ?

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  14. How is pyrophosphoric acid related to orthophosphoric acid ?

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  15. Why are the group 16 element called chalcogens ?

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  16. What is the outer shell electronic configuration of the chalcogens ?

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  17. Write the structure of a chalcogenide dianion.

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  18. Name the allotropes of oxygen.

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  19. The two O-O bond lengths in ozone molecule are equal. Assign reason.

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  20. Ozone is thermodynamically unstable. Give reasons.

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