Chemistry · Thermodynamics & Thermochemistry

JEE Main 2026 — 5 April, Evening Shift — Question 53

The correct order of molar heat capacities measured at 298 K and 1 bar is:

Option A:
Copper (s) > Bromine (l) > Helium (g)
Option B:
Bromine (l) > Copper (s) > Helium (g)
Correct
Option C:
Helium (g) $>$ Bromine (l) $>$ Copper (s)
Option D:
Helium (g) $>$ Bromine (l) = Copper (s)

Answer: B

Step-by-step solution

Generally molar heat capacity of liquids is greater than solids because liquids have greater degrees of freedom & thus can store more energy with lesser temperature rise.

Also for monoatomic gases molar heat capacity is low as only transalational degrees of freedom are present. ∴ order is : $\mathrm{Br}_{2}(\ell)>\mathrm{Cu}(\mathrm{s})>\mathrm{He}(\mathrm{g})$

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Exam: JEE Main 2026
Paper: 5 April, Evening Shift
Subject: Chemistry
Chapter: Thermodynamics & Thermochemistry
Topic: Enthalpy and Calorimetry

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Step-by-step solution

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