Observe the following data ( $\Delta_t H_1, \Delta_t H_2$ and $\Delta_{\mathrm{eg}} H$ represent the first, second ionisation enthalpies and electron gain enthalpy respectively)
| $$ \text { Element } $$ |
$$ \Delta_l H_1\left(\mathrm{kJmol}^{-1}\right) $$ |
$$ \Delta_1 H_2\left(\mathrm{kJmol}^{-1}\right) $$ |
$$ \Delta_{\mathrm{eg}} H\left(\mathrm{kJmol}^{-1}\right) $$ |
|---|---|---|---|
| I | 520 | 7300 | -60 |
| II | 490 | 3051 | -48 |
| III | 1681 | 3374 | -328 |
| IV | 2372 | 5251 | +48 |
Using the data identify the most reactive metal.
The sum of bond order of $\mathrm{O}_2^{+}, \mathrm{O}_2^{-}, \mathrm{O}_2$ and $\mathrm{O}_2^{2+}$ is equal to
Observe the following statements
Statement-I Hybridisation is not same in both $\mathrm{SF}_6$ and $\mathrm{BrF}_5$.
Statement-II $\mathrm{BrF}_5$ is square pyramidal while $\mathrm{SF}_6$ is octahedral in shape.
The correct answer is
At $T(\mathrm{~K})$ root mean square (rms) velocity of argon (molar mass $40 \mathrm{~g} \mathrm{~mol}^{-1}$ ) is $20 \mathrm{~ms}^{-1}$. The average kinetic energy of the same gas at $T(\mathrm{~K})$ (in $\mathrm{J} \mathrm{mol}^{-1}$ ) is
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