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AIIMS 2005
Exam
AIIMS
Year
2005
Subject
Chemistry
Chapter
Thermodynamics (C)

AIIMS 2005 · Chemistry · Thermodynamics (C)

Δ H_f^ (298 ~K) of methanol is given by the chemical equation

ΔHf∘(298 K)\Delta H_f^{\circ}(298 \mathrm{~K}) of methanol is given by the chemical equation

Options

  1. ACH4(g)+12O2(g)→CH3OH(g)\mathrm{CH}_{4(g)}+\frac{1}{2} \mathrm{O}_{2(g)} \rightarrow \mathrm{CH}_3 \mathrm{OH}_{(g)}
  2. BC\mathrm{C} (graphite) +12O2(g)+2H2(g)→CH3OH+\frac{1}{2} \mathrm{O}_{2(g)}+2 \mathrm{H}_{2(g)} \rightarrow \mathrm{CH}_3 \mathrm{OH}
  3. CC\mathrm{C} (diamond) +12O2(g)+2H2(g)→CH3OH+\frac{1}{2} \mathrm{O}_{2(g)}+2 \mathrm{H}_{2(g)} \rightarrow \mathrm{CH}_3 \mathrm{OH}
  4. DCO(g)+2H2(g)→CH3OH(l)\mathrm{CO}_{(g)}+2 \mathrm{H}_{2(g)} \rightarrow \mathrm{CH}_3 \mathrm{OH}_{(l)}.

Correct answer

B. C\mathrm{C} (graphite) +12O2(g)+2H2(g)→CH3OH+\frac{1}{2} \mathrm{O}_{2(g)}+2 \mathrm{H}_{2(g)} \rightarrow \mathrm{CH}_3 \mathrm{OH}

Step-by-step solution

Methanol can be prepared synthetically by heating carbon monoxide and hydrogen gases under pressure in the presence of a catalyst. C (graphite) +1/2O2→CO(g)CO(g)+2H2(g)→CH3OH\begin{aligned} & \mathrm{C} \text{ (graphite) }+1 / 2 \mathrm{O}_2 \rightarrow \mathrm{CO}_{(g)} \\ & \mathrm{CO}_{(g)}+2 \mathrm{H}_{2(g)} \rightarrow \mathrm{CH}_3 \mathrm{OH} \end{aligned} C (graphite) +1/2O2(g)+2H2(g)→CH3OH(l)‾\overline{\mathrm{C} \text{ (graphite) }+1 / 2 \mathrm{O}_{2(g)}+2 \mathrm{H}_{2(g)} \rightarrow \mathrm{CH}_3 \mathrm{OH}_{(l)}}
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