Chapter Exam

Unit 6: Thermo Dynamics — Online MCQ Test

Q: Which of the following is an example of an open system?

Answer: C. A human body — A human body exchanges both matter and energy with the surroundings, so it is an open system.

Q: Which of the following is a state function?

Answer: C. Internal energy — Internal energy depends only on the state of the system, not on the path taken.

Q: For an exothermic reaction at constant pressure, the enthalpy change is:

Answer: B. Negative — In an exothermic reaction, heat is released by the system, so ΔH is negative at constant pressure.

Q: For a reaction with ΔH = +40 kJ mol⁻¹ and ΔS = +100 J mol⁻¹ K⁻¹, at what temperature does spontaneity begin? (Use T = ΔH/ΔS)

Answer: C. 400 K — Convert ΔH to 40000 J mol⁻¹. Then T = 40000/100 = 400 K, which is the threshold temperature.

Q: Which of the following is the correct relation between heat absorbed at constant pressure and enthalpy change?

Answer: C. q_p = ΔH — At constant pressure, the heat absorbed or released by the system equals the enthalpy change.

CHEMISTRY · CLASS 11 INTERMEDIATE 1 YEAR · Telangana State Board

Practice Unit 6: Thermo Dynamics with a free chapter-wise online MCQ test for Telangana State Board CLASS 11 INTERMEDIATE 1 YEAR CHEMISTRY. This chapter covers: This chapter details system types state functions first second third laws of thermodynamics enthalpy heat capacity and Hess law. Students examine spontaneity Gibbs free energy chan.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Unit 6: Thermo Dynamics — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 11 INTERMEDIATE 1 YEAR CHEMISTRY — Unit 6: Thermo Dynamics, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is an example of an open system?