Assertion (A) $\mathrm{Mg}^{2+}$ and $\mathrm{Al}^{3+}$ are isoelectronic but the magnitude of ionic radius of $\mathrm{Al}^{3+}$ is less than that in $\mathrm{Mg}^{2+}$.
Reason (R) The effective nuclear charge on the outermost electrons in $\mathrm{Al}^{3+}$ is greater than that in $\mathrm{Mg}^{2+}$.The correct option among the following is
The successive ionisation energy values for an element ' $X$ ' are given below :
(i) 1st ionisation energy $=410 \mathrm{~kJ} \mathrm{~mol}^{-1}$
(ii) 2nd ionisation energy $=820 \mathrm{~kJ} \mathrm{~mol}^{-1}$
(iii) 3rd ionisation energy $=1100 \mathrm{~kJ} \mathrm{~mol}^{-1}$
(iv) 4th ionisation energy $=1500 \mathrm{~kJ} \mathrm{~mol}^{-1}$
(v) 5th ionisation energy $=3200 \mathrm{~kJ} \mathrm{~mol}^{-1}$
$$ \text { Match the following : } $$
| List-I | List-II | ||
| A. | I. | Tetrahedral | |
| B. | II. | Trigonal planar | |
| C. | III. | T-shape | |
| D. | IV. | Trigonal pyramidal | |
$$ \text { The correct match is } $$
Which of the following molecules does not exist according to molecular orbital theory?
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