The incorrect statement is.

1. The spin-only magnetic moments of ${\left[\mathrm{F}\mathrm{e}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ and ${\left[\mathrm{C}\mathrm{r}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ are nearly similar.
2. The spin-only magnetic moment of ${\left[\mathrm{N}\mathrm{i}{\left(\mathrm{N}{\mathrm{H}}_3\right)}_4{\left({\mathrm{H}}_2\mathrm{O}\right)}_2\right]}^{2+}$ is $2.83\mathrm{ }\mathrm{B}\mathrm{M}.$
3. The gemstone, ruby, has $\mathrm{C}{\mathrm{r}}^{3+}$ ions occupying the octahedral sites of beryl.
4. The color of ${\left[\mathrm{C}\mathrm{o}\mathrm{C}\mathrm{l}{\left(\mathrm{N}{\mathrm{H}}_3\right)}_5\right]}^{2+}$ is violet as it absorbs the yellow light.

Solution

Asked in: JEE Main 2019 (10 Apr Shift 2)

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