If the bidentate ligand ethane-1,2-diamine is progressively added to a solution in varying molar ratios, the following coordination complexes are formed: I. $\left[ \text{Ni} \left( \text{H}_2\text{O} \right)_4 \text{en} \right]_{\text{aq}}^{2+}$ - pale blue II. $\left[ \text{Ni} \left( \text{H}_2\text{O} \right)_2 (\text{en})_2 \right]_{\text{aq}}^{2+}$ - blue/purple III. $\left[ \text{Ni}(\text{en})_3 \right]_{\text{aq}}^{2+}$ - violet The wavelengths of light absorbed, in $\text{nm}$, for complexes I and III are, respectively.

Question

If the bidentate ligand ethane-1,2-diamine is progressively added to a solution in varying molar ratios, the following coordination complexes are formed:

I. $\left[ \text{Ni} \left( \text{H}_2\text{O} \right)_4 \text{en} \right]_{\text{aq}}^{2+}$ - pale blue
II. $\left[ \text{Ni} \left( \text{H}_2\text{O} \right)_2 (\text{en})_2 \right]_{\text{aq}}^{2+}$ - blue/purple
III. $\left[ \text{Ni}(\text{en})_3 \right]_{\text{aq}}^{2+}$ - violet

The wavelengths of light absorbed, in $\text{nm}$, for complexes I and III are, respectively.

310 nm and 500 nm

600 nm and 535 nm

475 nm and 310 nm

300 nm and 475 nm

Solution

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