The number of lone pairs of electrons present on $\mathrm{Xe}$ in $\mathrm{XeF}_4$ is

The number of lone pairs of electrons present on $\mathrm{Xe}$ in $\mathrm{XeF}_4$ is
  1. $3$
  2. $4$
  3. $1$
  4. $2$

Solution

Xe in ground state $\longrightarrow \ldots 5 s^2, 5 p^6, 5 d^6$ $X_e$ in IInd excited state $\longrightarrow \ldots 5 s^2, 5 p^4, 5 d^2$ $\longrightarrow \ldots .5 s^2, 5 p^4, 5 d^2$
Number of lone pairs $=2$ Number of bond pairs $=4$

Asked in: AP EAMCET 2001

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