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JEE Main 2026 Apr 5 Shift 2, Chemistry Q5: Basic Concepts of Thermodynamic

JEE Main2026Apr 5, Shift 2Chemistry
Q.

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

  1. A

    Copper (s) Bromine (l) Helium (g)

  2. B

    Bromine (l) Copper (s) Helium (g)

  3. C

    Helium (g) Bromine (l) Copper (s)

  4. D

    Helium (g) Bromine (l) Copper (s)

Solution

Molar heat capacity reflects how many ways a substance can store thermal energy (degrees of freedom).

Bromine (l) — a diatomic liquid — has vibrational, rotational, and translational modes available, plus stronger intermolecular interactions, giving the highest molar .

Copper (s) — a metallic solid — has lattice vibrational modes (Dulong–Petit value J/mol·K).

Helium (g) — a monatomic gas — has only translational degrees of freedom, giving the lowest molar ( J/mol·K at constant volume).

Br(l) Cu(s) He(g).

Concept behind this question

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