- ✓Formation of trihalides.
- BHigh ionisation energy.
- CSmall size.
- DHigh electronegativity.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$(i)\, 6C(s) + 3H_2(g) \to C_6H_6(l) ; \Delta H = +45.9\,kJ$
$(ii)\, H_2(g) +\frac {1}{2}O_2(g) \to H_2O(l) ; \Delta H = -285.9\,kJ$
$(iii) \,C(s) + O_2(g) \to CO_2(g) ; \Delta H = -393.5\,kJ$
.....$kJ$

$\frac{1}{2}\,{P_4}(s)\,\, + \,\,3C{l_2}(g)\, \to \,2PC{l_3}(\ell )\,\,\,\,\,\Delta H\, = \, - \,635\,\,kJ$
$PCl_3 (\ell )\,+\,Cl_2(g)\,\to \,PCl_5(s) \,\,\,\,\Delta H\, =\, -\,137\,kJ$.....$kJ$
Statement $(I)$ : $\mathrm{SiO}_2$ and $\mathrm{GeO}_2$ are acidic while $\mathrm{SnO}$ and $\mathrm{PbO}$ are amphoteric in nature.
Statement $(II)$ : Allotropic forms of carbon are due to property of catenation and $\mathrm{p} \pi-\mathrm{d} \pi$ bond formation.
In the light of the above statements, choose the most appropriate answer from the options given below: