Tue February 19, 2013 By: Usha Kiran

what are important questions in p-block, which should not be taken granted?

Expert Reply
Tue February 19, 2013
[A] What are silicones.
  1. Oxidation states of tin and lead
  2. Structures of oxides of nitrogen and phosphorus
  3. Electron affinities of chlorine and fluorine
  4. Maximum covalency of oxygen and sulphur
  1. Give the comparative account of the chemistry of carbon and silicon with regard to their:
    [i] property of catenation
    [ii] stability of hydrides and oxides
  2. Account for the following:
    [i] Ammonia has higher boiling point than phosphine
    [ii] Trimethyl ammine is pyramidal and trisilyl ammine is planar.
    [iii] Ammonia is stronger base than phosphine.
  3. Describe the following about halogen family:
    [i] Oxidising power
    [ii] Relative strength of their hydrides
    [iii] Oxyacids and their related oxidising ability
  4. Give reason for the following observations.
    [i] Noble gases are mostly chemicallly inert
    [ii] Nitrogen does not form pentahalide
    [iii] Bismuth is a strong oxidising agent in pentavalent state
  5. [i] Discuss two similar and two dissimilar properties from the chemistry of nitrogen and that of phosphorous.
    [ii] State the reason for the occurrence of diagonal relationship in the periodic table
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