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NEET Exam  >  NEET Tests  >  Chemistry Class 11  >  Assertion & Reason Test: Thermodynamics - NEET MCQ

Assertion & Reason Test: Thermodynamics - NEET MCQ


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8 Questions MCQ Test Chemistry Class 11 - Assertion & Reason Test: Thermodynamics

Assertion & Reason Test: Thermodynamics for NEET 2024 is part of Chemistry Class 11 preparation. The Assertion & Reason Test: Thermodynamics questions and answers have been prepared according to the NEET exam syllabus.The Assertion & Reason Test: Thermodynamics MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Thermodynamics below.
Solutions of Assertion & Reason Test: Thermodynamics questions in English are available as part of our Chemistry Class 11 for NEET & Assertion & Reason Test: Thermodynamics solutions in Hindi for Chemistry Class 11 course. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free. Attempt Assertion & Reason Test: Thermodynamics | 8 questions in 16 minutes | Mock test for NEET preparation | Free important questions MCQ to study Chemistry Class 11 for NEET Exam | Download free PDF with solutions
Assertion & Reason Test: Thermodynamics - Question 1
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In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Combustion of all organic compounds is an exothermic reaction.

Reason (R) : The enthalpies of all elements in their standard state are zero.

Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 1
Reason (R) : Combustion reactions breaks the bonds of organic compound molecules, and the resulting water and carbon dioxide bonds always release more energy than was used to break them originally. That’s why burning organic compounds produces energy and is exothermic.
Assertion & Reason Test: Thermodynamics - Question 2
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In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A) : Spontaneous process is an irreversible process and may be reversed by some external agency.

Reason (R) : Decrease in enthalpy is a contributory factor for spontaneity.

Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 2
Decrease in enthalpy may be a contributory factor for spontaneity, but it is not true for all cases. Entropy is also one of the external agency.
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Assertion & Reason Test: Thermodynamics - Question 3
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In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A) : A liquid crystallises into a solid and is accompanied by decrease in entropy.

Reason (R) : In crystals, molecules organise in an ordered manner.

Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 3
Entropy of system decreases when the liquid changes into solid. In crystalline state,molecules are ordered having less randomness.
Assertion & Reason Test: Thermodynamics - Question 4
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In the following questions, more than one correlation is possible between options of both columns.

Match the following:
Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 4
Correct match is

(i) Adiabatic process - No transfer of heat

(ii) Isolated system - No exchange of energy and matter

(iii) Isothermal change - Constant temperature

(iv) Path function - Heat

(v) State function - Internal energy, Entropy, Pressure

(vi) ΔU = q - At constant volume

(vii) Law of conservation of energy - First law of thermodynamics

(viii) Reversible process - Infinitely slow process which proceeds through a series of equilibrium states.

(ix) Free expansion - pext = 0

(x) ΔH = q - At constant pressure

(xi) Intensive property - Heat, Pressure, Specific heat

(xii) Extensive property - Internal energy, Entropy

Assertion & Reason Test: Thermodynamics - Question 5
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Match the following processes with entropy change:
Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 5

Assertion & Reason Test: Thermodynamics - Question 6
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Match the following parameters with description for spontaneity :
Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 6

Assertion & Reason Test: Thermodynamics - Question 7
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Match the following :
Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 7

Assertion & Reason Test: Thermodynamics - Question 8
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Assertion: The second law of thermodynamics states that the entropy of a closed or isolated system always increases. This means that all available energy is used up and there is no more potential for further useful work.

Reason: The system becomes disordered and also degraded.
Detailed Solution for Assertion & Reason Test: Thermodynamics - Question 8
  • Degraded energy is energy that becomes unavailable which means it is no longer able to produce work.
  • Degraded energy has a connection with the second law of thermodynamics. The second law of thermodynamics states that the entropy of a closed or isolated system always increases. This means that all available energy is used up and there is no more potential for further useful work. The system becomes disordered and also degraded. This is also called the Entropy Law.
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