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.
The correct answer is
| 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. Blue | X: 675 |
| B. $\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]\left(\mathrm{NO}_{3}\right)_{2}$ | II. Green | Y: 565 |
| C. $\left[\mathrm{Ni}(\mathrm{en})_{3}\right]\left(\mathrm{NO}_{3}\right)_{2}$ | III. Violet | Z: 615 |
(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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