CBSE Class 12 Chemistry The P Block Elements Worksheet Set 06

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The p- Block Elements
 
1. Why does NO2 dimerise?
 
2. Fluorine does not exhibit any positive oxidation state. Why? (2010)
 
3. What happens when H3PO3 is heated?
 
4. Name a compound in which chlorine displays ‘+7’ oxidation number.
 
5. On heating Cu turnings with conc. HNO3, a brown coloured gas is evolved which on cooling dimerises. Identify the gas.
 
6. Explain why
a) Noble gases form compounds with oxygen and fluorine only.
b) Unlike phosphorous, nitrogen has no tendency for catenation.
 
7. Complete the following reactions:
a) Zn + HNO3(conc.) →
b) Cl2 + NaOH (hot, Con) →
 
8. Give equations for the manufacture of
a) Ammonia from nitrogen b) Nitric acid from ammonia
 
9. Arrange the following in order of the property mentioned.
a) HF, HCl, HBr, HI (increasing acid strength)
b) NH3, PH3, AsH3, SbH3 (increasing basic strength)
c) HOCl, HOClO, HOClO3 (increasing oxidizing power)
 
10. What are interhalogen compounds? How are they prepared? Why are they more reactive than molecular halogens?
 
11. Explain why
a) H2S is gas while water is liquid at room temperature.
b) Helium is used in diving apparatus.
c) Iron dissolves in HCl to form FeCl2 and not FeCl3.
 
12. a) Account for the following :
i) Bond angle in NH4+ is greater than that in NH3.
← ii) Reducing character decreases from SO2 to TeO2.
← iii) HClO4 is a stronger acid than HClO.
(b) Draw the structures of the following :
i) H2S2O8
ii) XeOF4
 
13. a) Complete the following chemical equation:
i) S8 + HNO3(conc.)→
ii) P4+ NaOH + H 2O →
b) Explain the following observations:
i) Sulphur in vapour state exhibits paramagnetic behavior.
ii) The stability of +3 state increases down the group in group 15 of the periodic table.
iii) XeF2 has a linear shape and not a bent structure.

 

Please click on below link to download CBSE Class 12 Chemistry The P Block Elements Worksheet Set B

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