Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEST2023ChemistryThermodynamics (C)

A certain amount ( n moles) of a monoatomic ideal gas changes from an initial state X (P₁, V₁, T₁ ) to a final state Y (P₂, V₂, T₂ ) . Let U, H , and S represent the changes in internal energy, enthalpy, and entropy, respectively in this process. The correct expression is

Options

  1. AH= U+P₂ (V₂-V₁ ) .
  2. BH= U+P₂ (V₂-V₁ )+V₂ (P₂-P₁ )
  3. CS=C_v (T₂ / T₁ )+n R (V₂ / V₁ )
  4. DS=(3 / 2) (P₁ V₁ / T₁ ) (T₂ / T₁ )+ (P₂ V₂ / T₂ ) (V₂ / V₁ )

Correct answer

D. S=(3 / 2) (P₁ V₁ / T₁ ) (T₂ / T₁ )+ (P₂ V₂ / T₂ ) (V₂ / V₁ )

Step-by-step solution

No solution available.

Practice Thermodynamics (C) on Quantrex Academy →

More from Thermodynamics (C)

Identify the INCORRECT statement 2026The standard enthalpies of formation of CH₄ (g), CO₂ (g) and H₂ O(l) are -74.8 kJ mol ⁻¹ , -393.5 kJ mol ⁻¹ and -285.8 kJ mol ⁻¹ respectively. Then the enthalpy change for the give 2026For an ideal gas undergoing an isothermal change, there is 2026Ozone is formed by the reaction O _ 2(g) + O _ (g) O _ 3(g) , H = -107.2 kJ . Given O=O bond energy is 498.0 kJ mol ⁻¹ , the average bond energy of ozone is: 2026H and S for a reaction are 35.5 kJ mol ⁻¹ and 83.6 J K ⁻¹ respectively. Assuming that H and S do not vary with temperature, the reaction is spontaneous when: 2026The heat of combustion of carbon to CO ₂ is -393.5 kJ mol ⁻¹ . The heat released on the formation of 35.2 g of CO ₂ by combustion of C is: 20265 moles of a gas is allowed to pass through a series of changes as shown in the graph, in a cyclic process. The processes C A , B C and A B respectively are 20251 mole of an ideal gas is allowed to expand isothermally and reversibly from 1 L to 5 L at 300 K. The change in enthalpy (in kJ ) is ( R =8.3 ~J ~K ⁻¹ ~mol ⁻¹ ) 2025 Full Thermodynamics (C) list All NEST PYQs