In Class 11 Final Exams there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Downloads of CBSE Class 11 Chemistry Chapter 6 Case Study and Passage-Based Questions with Answers were Prepared Based on the Latest Exam Pattern. Students can solve Class 11 Chemistry Case Study Questions Thermodynamics to know their preparation level.
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In CBSE Class 11 Chemistry Paper, There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.
Thermodynamics Case Study Questions With Answers
Here, we have provided case-based/passage-based questions for Class 11 Chemistry Chapter 6 Thermodynamics
Case Study/Passage-Based Questions
Case Study 1: Hess’s Law of Constant Heat Summation – This law was presented by Hess in 1840. According to the law, if a chemical reaction can be made to take place in a number of ways in one or in several steps, the total enthalpy change is always the same.
Thus, the total enthalpy change of a chemical reaction depends on the initial and final stages only.
In which of the enlisted cases, Hess’s law is not applicable?
(a) Determination of lattice energy
(b) Determination of resonance energy
(c) Determination of enthalpy of transformation of one allotropic form to another
(d) Determination of entropy
Answer: (d) Determination of entropy
Use the bond energy data and calculate the enthalpy change for
Answer: (c) -1428kJ/mol
A hypothetical reaction, A 2B, proceeds through the following sequence of steps :
Answer: (c) q1+q2+2q3
Case Study/Passage-Based Questions
Case Study 2:The enthalpy of a system is defined as the sum of the internal energy of the system and the energy that arises due to its pressure and volume. Mathematically, the enthalpy is defined by the equation,
H = U + PV
Enthalpy change (ΔH) of a system is the heat absorbed or evolved by the system at constant pressure.
ΔH = qp, ΔH = ΔU + PΔV
Which of the following is not correct about enthalpy?
(a) It is an extensive property.
(b) It is not a state function.
(c) Its absolute value cannot be determined.
(d) Enthalpy of a compound is equal to the enthalpy of formation of that compound.
Answer: (b) It is not a state function.
Lattice enthalpies are determined by
(a) Born-Haber cycle (b) Hess’s law
(c) lattice cycle (d) none of these
Answer: (a) Born-Haber cycle
In which of the following thermochemical changes ΔH is always negative?
(a) Enthalpy of solution
(b) Enthalpy of hydrogenation
(c) Enthalpy of reaction
(d) Enthalpy of transition
Answer: (b) Enthalpy of hydrogenation
Case Study 3: Thermodynamics is a branch of chemistry that deals with the study of energy transformations in chemical and physical processes. It is concerned with the interrelation of heat and work with chemical reactions or physical changes in a system. One of the key concepts in thermodynamics is the notion of internal energy, which is the sum of the kinetic and potential energies of the particles within a system. The first law of thermodynamics, also known as the law of energy conservation, states that energy cannot be created or destroyed, only converted from one form to another. It establishes the principle of energy conservation and the concept of heat transfer as a form of energy flow. The second law of thermodynamics deals with the direction of energy flow and states that in natural processes, the total entropy of a system and its surroundings always increases. Entropy is a measure of the disorder or randomness in a system, and this law provides insights into the irreversibility of certain processes.
Thermodynamics is a branch of chemistry concerned with the study of:
(a) Particle interactions
(b) Energy transformations in chemical and physical processes
(c) Atomic structures
(d) Organic reactions
Answer: (b) Energy transformations in chemical and physical processes
Internal energy in a system is the sum of:
(a) Kinetic energy of particles only
(b) Potential energy of particles only
(c) Both kinetic and potential energies of particles
(d) Total energy of the system
Answer: (c) Both kinetic and potential energies of particles
The first law of thermodynamics is also known as the law of:
(a) Heat transfer
(b) Energy conservation
(c) Entropy increase
(d) Internal energy
Answer: (b) Energy conservation
The second law of thermodynamics states that in natural processes, the total entropy of a system and its surroundings always:
(a) Decreases
(b) Remains constant
(c) Fluctuates
(d) Increases
Answer: (d) Increases
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