Match List I with List II : Choose the correct answer :List I (Complex/Ion) List II (Shape/geometry) A. $[Pt(Cl)_2(NH_3)_2]$ I. Octahedral B. $[Co(NH_3)_6]Cl_3$ II. Trigonal bipyramidal C. $[NiCl_4]^{2-}$ III. Square planar D. $[Fe(CO)_5]$ IV. Tetrahedral
A-III, B-I, C-IV, D-II
This question requires matching coordination complexes and ions from List I with their respective geometric shapes from List II.
Determining Complex Geometries
Complex A: $[Pt(Cl)_2(NH_3)_2]$ Geometry
This complex contains Platinum in the +2 oxidation state ($Pt^{2+}$). $Pt(II)$ complexes, especially with coordination number 4, typically adopt a square planar geometry. Thus, $[Pt(Cl)_2(NH_3)_2]$ corresponds to geometry III.
Complex B: $[Co(NH_3)_6]Cl_3$ Geometry
This complex contains Cobalt in the +3 oxidation state ($Co^{3+}$). $Co^{3+}$ with a coordination number of 6, as in $[Co(NH_3)_6]^{3+}$, commonly exhibits an octahedral geometry. Thus, $[Co(NH_3)_6]Cl_3$ corresponds to geometry I.
Complex C: $[NiCl_4]^{2-}$ Geometry
This is a Nickel(II) complex ($Ni^{2+}$). $Ni(II)$ ($d^8$) with weak field ligands like chloride ($Cl^-$) typically forms a tetrahedral geometry. Thus, $[NiCl_4]^{2-}$ corresponds to geometry IV.
Complex D: $[Fe(CO)_5]$ Geometry
This complex is Iron pentacarbonyl, with Iron in the 0 oxidation state (Fe(0)). It has a coordination number of 5. Complexes with a coordination number of 5 commonly adopt a trigonal bipyramidal geometry. Thus, $[Fe(CO)_5]$ corresponds to geometry II.
Summary of Matches
Based on the analysis:
- A: $[Pt(Cl)_2(NH_3)_2]$ - Square planar (III)
- B: $[Co(NH_3)_6]Cl_3$ - Octahedral (I)
- C: $[NiCl_4]^{2-}$ - Tetrahedral (IV)
- D: $[Fe(CO)_5]$ - Trigonal bipyramidal (II)
| List I (Complex/Ion) | List II (Shape/Geometry) | Match |
|---|---|---|
| A. $[Pt(Cl)_2(NH_3)_2]$ | I. Octahedral | III. Square planar |
| B. $[Co(NH_3)_6]Cl_3$ | II. Trigonal bipyramidal | I. Octahedral |
| C. $[NiCl_4]^{2-}$ | III. Square planar | IV. Tetrahedral |
| D. $[Fe(CO)_5]$ | IV. Tetrahedral | II. Trigonal bipyramidal |
The correct matching is A-III, B-I, C-IV, D-II.
Similar Questions
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Important Questions from Inorganic Chemistry
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A. The complex exhibits geometrical isomerism.
B. The complex is white in colour.
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D. The calculated CFSE (Crystal Field Stabilization Energy) of Ni in this complex is $-0.8 \, \Delta_0$.
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Statement II : The second and third ionization enthalpies of Cr are higher than those of Mn.
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Statement II : $\text{BCl}_3$ is covalent in nature and gets hydrolysed in water. It produces $[\text{B(OH)}_4]^-$ and $[\text{B(H}_2\text{O)}_6]^{3+}$ in aqueous medium.
In the light of the above statements, choose the correct answer from the options given below :
