pBlock ElementsII - Result Question 60

####55. Statement I Although PF5,PCl5 and PBr5 are known, the pentahalides of nitrogen have not been observed.

Statement II Phosphorus has lower electronegativity than nitrogen.

(1994, 2M)

Passage Based Questions

Passage

Upon heating KClO3 in presence of catalytic amount of MnO2, a gas W is formed. Excess amount of W reacts with white phosphorus to give X. The reaction of X with pure HNO3 gives Y and Z.

(2017 Adv.)

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Solution:

  1. Both Statement I and Statement II are independently correct but reason is not the correct explanation of Statement I. Nitrogen does not has any vacant d-orbitals, it cannot expand its valence shell beyond eight electrons, i.e. it cannot violate octet. Therefore, nitrogen forms only trihalides ( NX3 with eight electrons in valence shell of N ).

Phosphorus has vacant 3d-orbitals, it can expand its valence shell beyond eight electrons, its both trihalides and pentahalides exist.

Passage

KClO3ΔMnO2KCl+O2W O2+P4ΔP4O10HNO3N2O5+HPO3



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