Q45. NH3 is a stronger base than PH3
(a) Phosphorus is smaller in size than nitrogen
(b) Nitrogen is smaller in size than phosphorus
(c) PH3 does not have lone pair of electron
(d) NH3 does not have l

Question

Q45. NH3 is a stronger base than PH3
(a) Phosphorus is smaller in size than nitrogen
(b) Nitrogen is smaller in size than phosphorus
(c) PH3 does not have lone pair of electron
(d) NH3 does not have lone pair of electron

FirstInTest · Accepted Answer

Correct answer: b. NH3 is a stronger base than PH3. This is because the lone pair of electrons on N atom in NH3 is directed and not diffused as it is in PH3 due to large size of phosphorus and hence more available for donation. Option (b) states "Nitrogen is smaller in size than phosphorus", which is true and contributes to the higher electronegativity and more concentrated lone pair on N, making NH3 a stronger base.

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