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Group 15 Elements

1. The document discusses various properties and reactions of group 15 elements, including nitrogen, phosphorus, and bismuth. 2. Key points covered include the different natures of bonds in phosphoric and nitric acid, how nitrogen is obtained industrially, why nitrogen is less reactive than the other group 15 elements, and why properties like reactivity and bonding tendencies vary down the group. 3. Multiple choice and short answer questions assess understanding of topics like oxidation states, ionic character, pentahalide formation, acid-base properties, molecular structures, and identification of compounds and reactions involving the group 15 elements.

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VaibhavMittal
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252 views1 page

Group 15 Elements

1. The document discusses various properties and reactions of group 15 elements, including nitrogen, phosphorus, and bismuth. 2. Key points covered include the different natures of bonds in phosphoric and nitric acid, how nitrogen is obtained industrially, why nitrogen is less reactive than the other group 15 elements, and why properties like reactivity and bonding tendencies vary down the group. 3. Multiple choice and short answer questions assess understanding of topics like oxidation states, ionic character, pentahalide formation, acid-base properties, molecular structures, and identification of compounds and reactions involving the group 15 elements.

Uploaded by

VaibhavMittal
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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TWENTEITH PAPER OF CHEMISTRY (p – BLOCK ELEMENTS – I {GROUP 15 ELEMENTS)

M.M:50 TIME: 1.30hrs


1. What is the difference between the natures of the pie – bonds in H₃PO₃ & HNO₃? 1
2. How can you obtain the pure nitrogen industrially? 1
3. Why dinitrogen is less reactive at room temperature? 1
4. Beryllium trihydride is the strongest reducing agent amongst all the hydrides of group 15 elements. How?1
5. How can you maximise the yield of ammonia? 1
6. What is the covalence of Nitrogen in N₂O₅? 1
7. Bond angle in PH₄⁺ is higher than in PH₃. Why? 1
8. Nitrogen exists as diatomic molecule but phosphorus exists as tetratomic molecule. Why? 1
9. Why nitrogen does shows less catenation property than phosphorous? 1
10. N-N Single bond is weaker than P-P single bond. Explain. 1
11. Bismuth (V) is a stronger oxidising agent than lead (V). 1
12. NO₂ dimerises N₂O₄. Why? 1
13. Ammonia is a stronger base than phosphine. Why? 1
14. NCl₃ gets readily hydrolysed while NF₃ doesn’t. Why? 1
15. Nitric oxide becomes brown when released in air. Give reasons. 1
16. Ammonia act as a ligand. How? 1
17. Solid phosphorous pentachloride solution exists some ionic character. Why? 1
18. Pentahalides of phosphorous is known but nitrogen doesn’t shows pentahalides. Why? 1
19. Nitric oxide is paramagnetic in the gaseous state but diamagnetic in the liquid & solid states. Why? 1
20. Tendency to form pentahalides decreases down the group in group 15 of the periodic table. Why? 1
21. Why all the P-Cl bonds in PCl₅ are not equivalent. Explain why? 1
22. In the solid state, PCl₅ behaves as an ionic species. Comment? 1
23. Red phosphorous is less reactive than white phosphorous. Why? 1
24. Why the bond angle in phosphine is lesser than that in ammonia molecule? 1
25. The stability of +5 oxidation state decreases down the group. Why? 1
26. What do you mean by Holme’s signals? 1
27. NF₃ is an exothermic compound but NCl₃ is not. Why? 1
28. Ammonia has greater affinity for protons than phosphine. Why? 1
29. The HNH angle is higher than HPH, HAsH & HSbH angles. Why? 1
30. Assign the oxidation no. of phosphorus in Caro’s acid. 1
31. Why does R₃P=O exists but R₃N=O doesn’t? (R: alkyl group) 1
32. Complete the following reaction:
a. P₄ + NaOH + H₂O 1
b. P₄ + SO₂Cl₂ 1
c. I₂ + HNO₃(conc.) 1
d. NH₃ + NaOCl 1
e. Cu²⁺ + NH₃ 1
33. Explain brown ring test. 3
34. On heating compound A gives a gas B which is a constituent of air. This gas when treated with 3mol of
hydrogen in the presence of a catalyst gives another gas C which is basic in nature. Gas C on further
oxidation in moist conditions give a compound D which is a part of acid rain. Identify all with reactions. 3
35. On heating Lead nitrate gives a brown gas A. The gas A on cooling changes to colourless solid B, which on
heating with NO changes to blue solid C. Identify all with reactions. 3
36. Draw the structure of the following: a.) Cyclotrimeric phosphoric acid. b.) pyrophosphoric acid. c.) nitrogen
pentoxides. d.) phosphorous pentoxides. e.) phosphorous pentachloride. 5

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