Q29 · CSIR-NET Chemistry, June 2017

Paper: CSIR-NET June 2017 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination Chemistry – General · Marks: 2 · Difficulty: Medium

Match the items in the three columns.
Complex (column 1)Color (column 2)Absorption max ($\lambda_{max}$, nm) (column 3)
A. $\left[\mathrm{Ni}\left(\mathrm{H}_{2}\mathrm{O}\right)_{6}\right]\left(\mathrm{NO}_{3}\right)_{2}$I. BlueX: 675
B. $\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]\left(\mathrm{NO}_{3}\right)_{2}$II. GreenY: 565
C. $\left[\mathrm{Ni}(\mathrm{en})_{3}\right]\left(\mathrm{NO}_{3}\right)_{2}$III. VioletZ: 615
The correct answer is
(a)A-II-X; B-I-Z; C-III-Y
(c)A-III-Y: B-1-Z; C-II-X
(b)A-I-X; B-II-Y; C-III-Z
(d)A-I-X; B-II-Z; C-III-Y
Answer
Answer: A ✓ checked by 4AB · confidence medium
Explanation
Stronger fields absorb at shorter λ. [Ni(H₂O)₆]²⁺ is green (absorbs ~675 nm), [Ni(NH₃)₆]²⁺ is blue (615 nm) and [Ni(en)₃]²⁺ is violet (565 nm). A-II-X, B-I-Z, C-III-Y (a).

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