Molar heat capacities measured |Thermodynamics|JEE MAIN 2026

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JEE MAIN_2026

05-04-26_S2

Question

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

Select the correct option:

A

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

B

Bromine(I) > Copper(s) > Helium(g)

C

Helium(g) > Bromine(I) > Copper(s)

D

Helium(g) > Bromine(I) = Copper(s)

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

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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