Examine the following species and determine the total number of distinct compounds/ions in which the metal centre adopts a tetrahedral geometry.
(i) $FeO_{4}^{2 -}$
(ii) $Fe (CO)_{4}^{2 -}$
(iii) $VOCl_{3}$
(iv) $CrO_{4}^{2 -}$
(v) $K_{3} CrO_{8}$
(vi) $K_{4} [Ni (CN)_{4}]$
(vii) $AuCl_{4}^{-}$
(viii) $MnO_{3} F$

Question

Examine the following species and determine the total number of distinct compounds/ions in which the metal centre adopts a tetrahedral geometry.

(i) $FeO_{4}^{2 -}$

(ii) $Fe (CO)_{4}^{2 -}$

(iii) $VOCl_{3}$

(iv) $CrO_{4}^{2 -}$

(v) $K_{3} CrO_{8}$

(vi) $K_{4} [Ni (CN)_{4}]$

(vii) $AuCl_{4}^{-}$

(viii) $MnO_{3} F$

TestHub · Accepted Answer

To determine tetrahedral geometry, we look for a central metal atom bonded to four ligands with no lone pairs on the metal.

(i) FeO₄²⁻: Fe(VI), d⁰, 4 ligands. Tetrahedral.

(ii) Fe(CO)₄²⁻: Fe(-II), d¹⁰, 4 ligands. Tetrahedral.

(iii) VOCl₃: V(V), d⁰, 4 ligands. Tetrahedral.

(iv) CrO₄²⁻: Cr(VI), d⁰, 4 ligands. Tetrahedral.

(v) K₃CrO₈: Cr(V), d¹, 8 ligands. Dodecahedral.

(vi) K₄[Ni(CN)₄]: Ni(0), d¹⁰, 4 ligands. Tetrahedral

(vii) AuCl₄⁻: Au(III), d⁸, 4 ligands. Square planar (strong field ligand).

(viii) MnO₃F: Mn(VII), d⁰, 4 ligands. Tetrahedral.

Thus, (i), (ii), (iii), (iv),(vi) and (viii) are tetrahedral. The total is 6.

Chemistry - Coordination Chemistry Question with Solution | TestHub