MCQ
The only radiactive element among the lanthanoids is
- Agadolinium
- Bholmium
- ✓
- D
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→| Column $I ($Pair of isomers$)$ | Column $II($Type of isomerism$)$ | ||
| $(p)$ | $\left.\begin{array}{l}\text { (I) }\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]\left[\mathrm{Cr}(\mathrm{CN})_6\right] \\ \text {(II) }\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_6\right]\left[\mathrm{Co}(\mathrm{CN})_6\right]\end{array}\right\}$ | $1.$ | Ionisation |
| $(q)$ | $\left.\begin{array}{l}\text { (III) }\left[\mathrm{PtCl}_2\left(\mathrm{NH}_3\right)_4\right] \mathrm{Br}_2 \\ \text { (IV) }\left[\mathrm{PtBr}_2\left(\mathrm{NH}_3\right)_4\right] \mathrm{Cl}_2\end{array}\right\}$ | $2.$ | Hydrate |
| $(r)$ | $\left.\begin{array}{l}\text { (V) }\left[\mathrm{Co}(\mathrm{SCN})\left(\mathrm{NH}_3\right)_5\right] \mathrm{Cl}_2 \\ \text {(VI) }\left[\mathrm{Co}(\mathrm{NCS})\left(\mathrm{NH}_3\right)_5\right] \mathrm{Cl}_2\end{array}\right\}$ | $3.$ | Coordination |
| $(s)$ | $\left.\begin{array}{l}(\mathrm{VII})\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_3 \\ (\mathrm{VIII})\left[\mathrm{CrCl}_2\left(\mathrm{H}_2 \mathrm{O}\right)_4\right] \mathrm{Cl} \cdot 2 \mathrm{H}_2 \mathrm{O}\end{array}\right\}$ | $4.$ | Geometrical |
| $5.$ | Linkage | ||
The correct structure of $\left[ Cr \left( H _2 O \right)_6\right]^{3+}$ is ………………………………..
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