Basic character of hydrides of group 15 is due to the presence of lone

1.	Basic character of hydrides of group 15 is due to the presence of lone pair on the central atom.1. NH3 is strongly basic while BiH3 is weakly basic. Why?2. Differentiate between allotropic forms of phosphorus.
Answer» 1. Due to the presence of lone pair of electrons on nitrogen atom of NH₃. But in BiH₃,due to the large size of Bi the electron density decreases and hence is less basic. 2. The allotropic forms of P are White, Red and Black phosphorus. White phosphorus consists of tetrahedral P molecules. Red phosphorus is polymeric in structure consisting of chains of P tetrahedra linked together. Black phosphorus has a layer type structure and has α and β forms.

Basic character of hydrides of group 15 is due to the presence of lone pair on the central atom.1. NH3 is strongly basic while BiH3 is weakly basic. Why?2. Differentiate between allotropic forms of phosphorus.

Answer»

1. Due to the presence of lone pair of electrons on nitrogen atom of NH₃. But in BiH₃,due to the large size of Bi the electron density decreases and hence is less basic.

2. The allotropic forms of P are White, Red and Black phosphorus. White phosphorus consists of tetrahedral P molecules. Red phosphorus is polymeric in structure consisting of chains of P tetrahedra linked together. Black phosphorus has a layer type structure and has α and β forms.

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Basic character of hydrides of group 15 is due to the presence of lone pair on the central atom.1. NH3 is strongly basic while BiH3 is weakly basic. Why?2. Differentiate between allotropic forms of phosphorus.

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