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Question

Match List I with List II :

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

Choose the correct answer :

This question was previously asked in
NEET UG Re-Exam 2026 Question Paper (21-Jun-2026)
The correct answer is

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.

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Important Questions from Inorganic Chemistry

  1. A chromium complex with a formula $\text{CrCl}_3\cdot 6\text{H}_2\text{O}$ has a spin only magnetic moment value of $3.87 \text{ BM}$ and its solution conductivity corresponds to $1 : 2$ electrolyte. $2.75 \text{ g}$ of the complex solution was initially passed through a cation exchanger. The solution obtained after the process was reacted with excess of $\text{AgNO}_3$. The amount of $\text{AgCl}$ formed in the above process is _____ g. (Nearest integer)
    [Given: Molar mass in $\text{g mol}^{-1}$ $\text{Cr} : 52; \text{Cl}: 35.5, \text{Ag}: 108, \text{O}: 16, \text{H}: 1$]
  2. Consider the following reactions :
    $\text{NaCl} + \text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4 \rightarrow \text{A} + \text{KHSO}_4 + \text{NaHSO}_4 + \text{H}_2\text{O}$
    $\text{A} + \text{NaOH} \rightarrow \text{B} + \text{NaCl} + \text{H}_2\text{O}$
    $\text{B} + \text{H}_2\text{SO}_4 + \text{H}_2\text{O}_2 \rightarrow \text{C} + \text{Na}_2\text{SO}_4 + \text{H}_2\text{O}$
    In the product 'C', 'X' is the number of $\text{O}_2^{2-}$ units, 'Y' is the total number oxygen atoms present and 'Z' is the oxidation state of Cr. The value of X + Y + Z is ____________.
  3. Identify the metal ions among $\text{Co}^{2+}, \text{Ni}^{2+}, \text{Fe}^{2+}, \text{V}^{3+}$ and $\text{Ti}^{2+}$ having a spin-only magnetic moment value more than $3.0\text{ BM}$. The sum of unpaired electrons present in the high spin octahedral complexes formed by those metal ions is __________.
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  5. Which of the following is the structure of pyrosulphuric acid?
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