MCQ
Which one of the following pairs is isostructural ($i.e.$, having the same shape and hybridization) ?
- A$[BCl_3$ and $BrCl_3]$
- B$[NH_3$ and $NO_3^-]$
- C$[NF_3$ and $BF_3]$
- ✓$[BF_4^-$ and $NH_4^+]$
$\mathrm{BrCl}_{3} \Rightarrow s p^{3} d, \quad$ T-shaped
$\mathrm{NH}_{3} \Rightarrow s p^{3}, \quad$ pyramidal
$\mathrm{NO}_{3}^{-} \Rightarrow s p^{2}, \quad$ trigonal planar
$\mathrm{NF}_{3} \Rightarrow s p^{3}, \quad$ pyramidal
$\mathrm{BF}_{3} \Rightarrow s p^{2}, \quad$ trigonal planar
$\begin{array}{ll}{\mathrm{BF}_{4}^{-} \Rightarrow s p^{3},} & {\text { tetrahedral }} \\ {\mathrm{NH}_{4}^{+} \Rightarrow s p^{3},} & {\text { tetrahedral }}\end{array}$
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$Fe ^{2+}( aq )+ S ^{2-}( aq ) \rightleftharpoons FeS ( s )$
When equal volumes of $0.06 M Fe ^{2+}( aq )$ and $0.2 M S ^{2-}( aq )$ solutions are mixed, the equilibrium concentration of $Fe ^{2+}$ (aq) is found to be $Y \times 10^{-17} M$. The value of $Y$ is. . . . .