Which of the following eations has $\Delta_{f} \mathrm{H}^{\circ}$ and $\Delta \mathrm{H}^{\circ}$ same?

Which of the following eations has $\Delta_{f} \mathrm{H}^{\circ}$ and $\Delta \mathrm{H}^{\circ}$ same?
  1. $\mathrm{H}_{2(\mathrm{~g})}+\frac{1}{2} \mathrm{O}_{2(\mathrm{~g})} \longrightarrow \mathrm{H}_{2} \mathrm{O}_{(\mathrm{l})}$
  2. $\mathrm{N}_{2(\mathrm{l})}+\mathrm{O}_{3(\mathrm{~g})} \longrightarrow \mathrm{N}_{2} \mathrm{O}_{3(\mathrm{~g})}$
  3. $\mathrm{CH}_{4(\mathrm{~g})}+2 \mathrm{Cl}_{2(\mathrm{~g})} \longrightarrow \mathrm{CH}_{2} \mathrm{Cl}_{2(\mathrm{~g})}+2 \mathrm{HCl}_{(\mathrm{g})}$
  4. $\mathrm{CO}_{(\mathrm{g})}+\mathrm{O}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{CO}_{2(\mathrm{~g})}$

Solution

Acetone and benzene have relatively similar boiling points and vapor pressures, making it difficult to separate them using simple distillation. Therefore, fractional distillation using a fractionating column is required to achieve effective separation. Answer: (3) Fractional distillation using fractionating column

Asked in: MHT CET 2020 (12 Oct Shift 2)

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