MCQ
In electrophilic substitution reaction nitrobenzene is
- APara-directing
- BOrtho-directing
- ✓Meta-directing
- DNot reactive and does not undergo any substitution

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$\Delta {H^o}\, = \, +234.1\,\,kJ$
$C(s)\, + {O_2}(g)\, \to \,\,C{O_2}(g)$
Use these equation and $\Delta H^o$ value to calculate $\Delta H^o$ for this reaction:
$4Fe(s) + 3O_2(g) \to 2Fe_2O_3(s)$
.....$kJ$


