Updated By SaraNextGen

On March 11, 2024, 11:35 AM

Question 7.7:

Bond angle in  is higher than that in PH₃. Why?

Answer:

In PH₃, P is sp³ hybridized. Three orbitals are involved in bonding with three hydrogen atoms and the fourth one contains a lone pair. As lone pair-bond pair repulsion is stronger than bond pair-bond pair repulsion, the tetrahedral shape associated with sp³ bonding is changed to pyramidal. PH₃ combines with a proton to form   in which the lone pair is absent. Due to the absence of lone pair in , there is no lone pair-bond pair repulsion. Hence, the bond angle in  is higher than the bond angle in PH₃.

Question 7.8:

What happens when white phosphorus is heated with concentrated NaOH solution in an inert atmosphere of CO₂?

Answer:

White phosphorous dissolves in boiling NaOH solution (in a CO₂ atmosphere) to give phosphine, PH₃.