MCQ
The ionisation potential of hydrogen from ground state to the first excited state is ........... $\mathrm{eV}$
- A$ - 13.6$
- B$ - 3.4$
- ✓$13.6$
- D$3.4$
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$B _{2}, Li _{2}, C _{2}, C _{2}^{-}, O _{2}^{2-}, O _{2}^{+}$and $He _{2}^{+}$
$PC{l_5}(g) \rightleftharpoons PC{l_3}(g) + C{l_2}(g)$ is