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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pn122

Which of the following statements about group 15 is/are correct?

  1. ADown the group the +5 oxidation state becomes more stable than the +3 state.
  2. BOxides change from acidic to basic character down the group, e.g. is acidic while is basic.
  3. C has a higher boiling point than .
  4. DThe N-N single bond is weaker than the P-P single bond.

Answer: B, C, D

N-N is weak due to lone pair repulsion between small N atoms, so (i) is true. Oxide acidity falls down the group, so (ii) is true. NH3 is hydrogen bonded, so it boils higher than PH3, (iii) true. The inert pair effect makes +3 more stable than +5 down the group, so the last statement is false.
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