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Q. No.Thermodynamics is not concerned about:
| 1. | Energy changes involved in a chemical reaction. |
| 2. | The extent to which a chemical reaction proceeds. |
| 3. | The rate at which a reaction proceeds. |
| 4. | The feasibility of a chemical reaction. |
Subtopic: Thermodynamics' Properties and process |
73%
Level 2: 60%+
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Thermodynamics primarily focuses on:
| (a) | Interrelation of various forms of energy and their transformation from one form to another. |
| (b) | Energy changes in the processes depend only on the initial and final states of the microscopic systems containing a few molecules. |
| (c) |
The mechanisms and rates at which energy transformations occur. |
| (d) |
Whether a system is in an equilibrium state or transitioning between one equilibrium state and another. |
The correct statements, among the above, are:
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. (a) and (d)
Subtopic: Classification of System, Extensive & Intensive Properties |
54%
Level 3: 35%-60%
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The correct statement among the following is:
| 1. | The presence of reacting species in a covered beaker is an example of an open system. |
| 2. | There is an exchange of energy as well as matter between the system and the surroundings in a closed system. |
| 3. | The presence of reactants in a closed vessel made up of copper is an example of a closed system. |
| 4. | The presence of reactants in a thermos flask or any other closed insulated vessel is an example of a closed system. |
Subtopic: Thermodynamics' Properties and process |
73%
Level 2: 60%+
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Links
A system that can neither exchange matter nor energy with the surroundings is classified as:
1. Open system
2. Isolated system
3. Closed system
4. Both (1) & (2)
Subtopic: Classification of System, Extensive & Intensive Properties |
92%
Level 1: 80%+
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Given below are two statements:
| Assertion (A): | Variables like P, V, and T are called state functions. |
| Reason (R): |
Their values depend solely on the system's state, and not on how it is reached. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Thermodynamics' Properties and process |
85%
Level 1: 80%+
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Match the terms in List I with their corresponding descriptions in List II:
| List I (Term) | List II (Description) | ||
| A. | Adiabatic process | i. | At constant temperature |
| B. | Isolated system | ii. | No transfer of heat |
| C. | Isothermal change | iii. | Heat |
| D. | Path function | iv. | No exchange of energy and matter |
Codes:
| A | B | C | D | |
| 1. | ii | iv | i | iii |
| 2. | iii | iv | i | ii |
| 3. | iv | iii | i | ii |
| 4. | iv | ii | i | iii |
Subtopic: First Law of Thermodynamics | Classification of System, Extensive & Intensive Properties |
85%
Level 1: 80%+
Hints
Match List I with List II.
Choose the correct answer from the options given below:
1. \(\text { A-IV, B-II, C-III, D-I }\)
2. \(\text { A-I, B-II, C-III, D-IV }\)
3. \(\text { A-II, B-III, C-IV, D-I }\)
4. \(\text { A-IV, B-III, C-II, D-I }\)
| List-I (Process) | List-II (Conditions) | ||
| A. | Isothermal process | I. | No heat exchange |
| B. | Isochoric process | II. | Carried out at constant temperature |
| C. | Isobaric process | III. | Carried out at constant volume |
| D. | Adiabatic process | IV. | Carried out at constant pressure |
1. \(\text { A-IV, B-II, C-III, D-I }\)
2. \(\text { A-I, B-II, C-III, D-IV }\)
3. \(\text { A-II, B-III, C-IV, D-I }\)
4. \(\text { A-IV, B-III, C-II, D-I }\)
Subtopic: Thermodynamics' Properties and process |
86%
Level 1: 80%+
NEET - 2024
Hints
Match the processes in Column-I with the correct expressions in Column-II:
| Column-I (Process) |
Column-II (Expression)
|
||
| a. | No heat is absorbed by the system from the surroundings, but work (w) is done on the system. | i. | ∆U = q – w, closed system. |
| b. | No work is done on the system, but q amount of heat is taken out from the system and given to the surroundings. | ii. | ΔU=Wad, for an adiabatic wall. |
| c. | w amount of work is done by the system and q amount of heat is supplied to the system. | iii. | ∆U = –q, thermally conducting walls. |
| 1. | a = i; b = ii; c = iii | 2. | a = ii; b = i; c = iii |
| 3. | a = ii; b = iii; c = i | 4. | a = iii; b = ii; c = i |
Subtopic: First Law of Thermodynamics |
83%
Level 1: 80%+
Hints
1 mol of monoatomic ideal gas expanded adiabatically against a constant pressure of 2 atm from 10L to 20L. The correct option for the above process is:
1. q = 20 L-atm
2. \(\Delta U = 0 \)
3. \(\Delta U = -20 ~\text L~\text {atm} \)
4. \(\text w = 10 ~\text L~ \text {atm} \)
1. q = 20 L-atm
2. \(\Delta U = 0 \)
3. \(\Delta U = -20 ~\text L~\text {atm} \)
4. \(\text w = 10 ~\text L~ \text {atm} \)
Subtopic: First Law of Thermodynamics |
82%
Level 1: 80%+
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An ideal gas is allowed to expand form 1 L to 10 L against a constant external pressure of 1 bar. The work done in kJ is:
1. +10.0
2. – 9.0
3. – 2.0
4. –0.9
Subtopic: First Law of Thermodynamics |
60%
Level 2: 60%+
JEE
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