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Chemistry · Thermodynamics & Thermochemistry

NEET (UG) 2025 — Question 60

C(s)+2H2( g)→CH4( g);ΔH=−74.8 kJ mol−1\mathrm{C}(\mathrm{s})+2 \mathrm{H}_{2}(\mathrm{~g}) \rightarrow \mathrm{CH}_{4}(\mathrm{~g}) ; \Delta \mathrm{H}=-74.8 \mathrm{~kJ} \mathrm{~mol}^{-1}

Which of the following diagrams gives an accurate representation of the above reaction?

[R→[\mathrm{R} \rightarrow reactants; P→\mathrm{P} \rightarrow products]

  1. Option A:
    Option A figure
    Correct
  2. Option B:
    Option B figure
  3. Option C:
    Option C figure
  4. Option D:
    Option D figure

Answer: A

Step-by-step solution

For Exothermic reaction

⇒ΔH=HP−HR=−ve\Rightarrow \Delta \mathrm{H}=\mathrm{H}_{\mathrm{P}}-\mathrm{H}_{\mathrm{R}}=-\mathrm{ve}

∴HR>HP\therefore \mathrm{H}_{\mathrm{R}}>\mathrm{H}_{\mathrm{P}}

Solution figure

Answer key and solution verified before publishing.

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Exam
NEET (UG) 2025
Paper
2025 paper
Subject
Chemistry
Chapter
Thermodynamics & Thermochemistry
Topic
Enthalpy and Calorimetry

More Thermodynamics & Thermochemistry questions from this paper

C ( s )+2 H 2 ( g ) rightarrow CH 4 ( g ) ; Δ H =-74.8 kJ mol -1… | NEET (UG) 2025 PYQ with Solution · DhiX AI