AP EAMCET · Chemistry · Coordination Compounds
The green coloured complex ion of nickel in its aqueous solution is
- A \(\left[\mathrm{Ni}(\mathrm{en})_3\right]^{2+}\)
- B \(\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_2(\mathrm{en})_2\right]^{2+}\)
- C \(\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_4(\mathrm{en})\right]^{2+}\)
- D \(\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\)
Answer & Solution
Correct Answer
(D) \(\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\)
Step-by-step Solution
Detailed explanation
In complex \(\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\) the strong ligand is absent. Thus, electrons do not go for pairing and two unpaired \(e^{-}\)are present in \(\mathrm{Ni}^{2+}\) complex. Hence, is a coloured complex.
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