MCQ
Carbon atoms in the compound ${(CN)_4}{C_2}$ are
- A$sp$ hybridized
- B$s{p^2}$ hybridized
- ✓$sp$ and $s{p^2}$ hybridized
- D$sp$, $s{p^2}$ and $s{p^3}$ hybridized

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Given $\Delta H$
$(i)\, Fe_2O_{3(s)}+3C_{(graphite)} \to 2Fe_{(s)} + 3CO_{(g)}$ $492\, kJ/mol$
$(ii)\, FeO_{(s)}+C_{(graphite)} \to Fe_{(s)} + CO_{(g)}$ $156\, kJ/mol$
$(iii)\, C_{(graphite)} + O_{2(g)} \to CO_{2(g)}$ $-393 \,kJ/mol$
$(iv)\, CO_{(g)} + \frac{1}{2}\, O_{2(g)} \to CO_{2(g)}$ $-283\, kJ/mol$
$(R = 8.314 \,J/mol\,K)\,(\ln 7.5 =2.01)$
