MCQ
$d_z^2$ orbital has :
- AA lobe along $Z-$ axis and a ring along $X-Y$ plane
- BA lobe along $Z-$ axis and a lobe along $X-Y$ plane
- CA lobe along $Z-$ axis and a ring along $Y-Z$ plane
- ✓A lobe and ring along $Z-$ axis
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| List $-I$ | List $-II$ |
|
$A.$ Melting point $[\mathrm{K}]$ |
$I.$ $\mathrm{Tl}>\mathrm{In}>\mathrm{Ga}>\mathrm{Al}>\mathrm{B}$ |
|
$B.$ Ionic Radius $\left[\mathrm{M}^{+3} / \mathrm{pm}\right]$ |
$II.$ $\mathrm{B}>\mathrm{Tl}>\mathrm{Al} \approx \mathrm{Ga}>\mathrm{In}$ |
| $C.$ $\Delta_{\mathrm{i}} \mathrm{H}_1 $ $ [\mathrm{~kJ} \mathrm{~mol}^{-1}]$ | $III.$ $\mathrm{Tl}>\mathrm{In}>\mathrm{Al}>\mathrm{Ga}>\mathrm{B}$ |
| $D.$ Atomic Radius $[pm]$ | $IV.$ $\mathrm{B}>\mathrm{Al}>\mathrm{Tl}>\mathrm{In}>\mathrm{Ga}$ |
$I :$ The three elements are metals.
$II :$ The electro negativities decrease from $X$ to $Y$ to $Z$.
$III :$ The atomic radius decreases in the order $X, Y$ and $Z.$
$IV : X, Y$ and $Z$ could be phosphorus, aluminium and sodium respectively.