MCQ
The pair, in which ions are isoelectronic with $Al ^{3+}$ is ..... .
- A$Br ^{-}$and $Be ^{2+}$
- B$Cl ^{-}$and $Li ^{+}$
- C$S ^{2-}$ and $K ^{+}$
- ✓$O ^{2-}$ and $Mg ^{2+}$
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$(a)$ $R_2SiO$ is repeating unit of linear silicones
$(b)$ $R$ $SiCl_3$ on hydrolysis followed by dehydration gives linear silicones
$(c)$ Silicones can be used as heat insulator
$(d)$ Silica is soluble in $HF$
The correct statement$(s)$ is/are
| LIST-I (Complex/Species) | LIST-II (Shape & magnetic moment) | ||
| A. | $\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]$ | I. | Tetrahedral, 2.8 BM |
| B. | $\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$ | II. | Square planar, 0 BM |
| C. | $\left[\mathrm{NiCl}_{4}\right]^{2-}$ | III. | Tetrahedral, 0 BM |
| D. | $\left[\mathrm{MnBr}_{4}\right]^{2-}$ | IV. | Tetrahedral, 5.9 BM |