5 Questions MCQ Test Chemistry Class 12 - Test: Group-15 Elements
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Nitrogen forms stable N2 molecule but phosphorus is converted to P4 from P2 because:
Detailed Solution for Test: Group-15 Elements - Question 4
pπ - pπ bonding in nitrogen is strong hence it can form triple bond with another N. Single N−N bond is weaker than P−P bond due to high interionic repulsion of non-bonding electrons. Hence, N=N is stable and P2 is not.
The decreasing order of boiling points of the following hydrides is:
Detailed Solution for Test: Group-15 Elements - Question 5
H2O and NH3 have abnormally high boiling boilling points of their tendency to form hydrogen bonds. NH3 has hiigher boiling point than phosphine and then boiling pont increase down the group because of increase in size . Hence the order of boiling point will be
H2O > SbH3 > NH3 > AsH3 > PH3
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