MCQ
Number of orbitats in $h$ sub-shell is
- ✓$11$
- B$15$
- C$17$
- D$19$
$l$ = $0$ $1$ $2$ $3$ $4$ $5$
Number of orbitals $ = 5 \times 2 + 1 = 11$
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$B _{2}, Li _{2}, C _{2}, C _{2}^{-}, O _{2}^{2-}, O _{2}^{+}$and $He _{2}^{+}$

| $Cl_2(g) \rightarrow 2Cl(g),$ | $242.3\,kJ\,mol^{-1}$ |
| $I_2(g) \rightarrow 2I(g),$ | $151.0\,kJ\,mol^{-1}$ |
| $ICl(g) \rightarrow I(g)+Cl(g),$ | $211.3\,kJ\,mol^{-1}$ |
| $I_2(s) \rightarrow I_2(g),$ | $62.76\,kJ\,mol^{-1}$ |
Given that the standard states for iodine and chlorine are $I_2(s)$ and $Cl_2(g),$ the standard enthalpy of formation for $ICl(g)$ is : ............... $\mathrm{kJ\,mol}^{-1}$