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(B) The basicity of hydrides of Group $15$ elements depends on the availability of the lone pair of electrons on the central atom.As we move down the

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$PH_3$ is less basic than $NH_3$

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(B) The basicity of hydrides of Group $15$ elements depends on the availability of the lone pair of electrons on the central atom.As we move down the group from $N$ to $P$,the atomic size increases.This causes the lone pair of electrons on the phosphorus atom to be more diffused over a larger volume compared to the nitrogen atom.Consequently,the electron density on the phosphorus atom is lower,making $PH_3$ a weaker Lewis base than $NH_3$.Therefore,$PH_3$ is less basic than $NH_3$.

With reference to protonic acids,which of the following statements is correct regarding the basicity of $PH_3$ and $NH_3$?

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