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Statement-1 : An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature.
Statement-2 : Entropy of an exothermic reaction always decrease with decrease in temperature.
- a)Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1
- b)Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1
- c)Statement-I is false, statement-2 is true.
- d)Statement-1 is true, statement-2 is false.
Correct answer is option 'C'. Can you explain this answer?
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Statement-1 : An exothermic reaction, non-spontaneous at high temperat...
Statement-I is false, statement-2 is true.
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Statement-1 : An exothermic reaction, non-spontaneous at high temperat...
Statement-1: An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature.
Statement-2: Entropy of an exothermic reaction always decreases with a decrease in temperature.
Explanation:
To understand the given statements, let's first define the terms involved.
Exothermic reaction: An exothermic reaction is a chemical reaction that releases heat to its surroundings. It is characterized by a negative change in enthalpy (∆H < />
Spontaneous reaction: A spontaneous reaction is a reaction that occurs naturally without any external influence. It is characterized by a negative change in Gibbs free energy (∆G < />
Entropy: Entropy (S) is a measure of the disorder or randomness in a system. It is related to the number of microstates or possible arrangements of particles in a given macrostate.
Now, let's analyze the given statements:
Statement-1: An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature.
This statement is true. The spontaneity of a reaction depends on both enthalpy and entropy. While an exothermic reaction releases heat (∆H < 0),="" it="" may="" still="" be="" non-spontaneous="" at="" high="" temperatures="" if="" the="" increase="" in="" entropy="" (∆s)="" is="" not="" sufficient="" to="" overcome="" the="" negative="" enthalpy="" change.="" however,="" at="" low="" temperatures,="" the="" decrease="" in="" entropy="" may="" become="" significant,="" causing="" the="" reaction="" to="" become="" />
Statement-2: Entropy of an exothermic reaction always decreases with a decrease in temperature.
This statement is true. According to the third law of thermodynamics, the entropy of a pure crystalline substance approaches zero at absolute zero temperature (0 Kelvin). As the temperature decreases, the number of accessible microstates decreases, resulting in a decrease in entropy. Therefore, the entropy of an exothermic reaction will generally decrease with a decrease in temperature.
Explanation of the correct answer:
The correct answer is option 'C' because Statement-1 is false and Statement-2 is true. The explanation for this is as follows:
- An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature, but this is not always the case. The spontaneity of a reaction depends on various factors including enthalpy, entropy, and temperature. Therefore, Statement-1 is false.
- The entropy of an exothermic reaction does decrease with a decrease in temperature, as explained earlier. This is because the decrease in temperature leads to a decrease in the number of accessible microstates. Therefore, Statement-2 is true.
Hence, the correct answer is option 'C' - Statement-I is false, and statement-2 is true.
Statement-2: Entropy of an exothermic reaction always decreases with a decrease in temperature.
Explanation:
To understand the given statements, let's first define the terms involved.
Exothermic reaction: An exothermic reaction is a chemical reaction that releases heat to its surroundings. It is characterized by a negative change in enthalpy (∆H < />
Spontaneous reaction: A spontaneous reaction is a reaction that occurs naturally without any external influence. It is characterized by a negative change in Gibbs free energy (∆G < />
Entropy: Entropy (S) is a measure of the disorder or randomness in a system. It is related to the number of microstates or possible arrangements of particles in a given macrostate.
Now, let's analyze the given statements:
Statement-1: An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature.
This statement is true. The spontaneity of a reaction depends on both enthalpy and entropy. While an exothermic reaction releases heat (∆H < 0),="" it="" may="" still="" be="" non-spontaneous="" at="" high="" temperatures="" if="" the="" increase="" in="" entropy="" (∆s)="" is="" not="" sufficient="" to="" overcome="" the="" negative="" enthalpy="" change.="" however,="" at="" low="" temperatures,="" the="" decrease="" in="" entropy="" may="" become="" significant,="" causing="" the="" reaction="" to="" become="" />
Statement-2: Entropy of an exothermic reaction always decreases with a decrease in temperature.
This statement is true. According to the third law of thermodynamics, the entropy of a pure crystalline substance approaches zero at absolute zero temperature (0 Kelvin). As the temperature decreases, the number of accessible microstates decreases, resulting in a decrease in entropy. Therefore, the entropy of an exothermic reaction will generally decrease with a decrease in temperature.
Explanation of the correct answer:
The correct answer is option 'C' because Statement-1 is false and Statement-2 is true. The explanation for this is as follows:
- An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature, but this is not always the case. The spontaneity of a reaction depends on various factors including enthalpy, entropy, and temperature. Therefore, Statement-1 is false.
- The entropy of an exothermic reaction does decrease with a decrease in temperature, as explained earlier. This is because the decrease in temperature leads to a decrease in the number of accessible microstates. Therefore, Statement-2 is true.
Hence, the correct answer is option 'C' - Statement-I is false, and statement-2 is true.
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Statement-1 : An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature.Statement-2 : Entropy of an exothermic reaction always decrease with decrease in temperature.a)Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1b)Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1c)Statement-I is false, statement-2 is true.d)Statement-1 is true, statement-2 is false.Correct answer is option 'C'. Can you explain this answer?
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Statement-1 : An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature.Statement-2 : Entropy of an exothermic reaction always decrease with decrease in temperature.a)Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1b)Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1c)Statement-I is false, statement-2 is true.d)Statement-1 is true, statement-2 is false.Correct answer is option 'C'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about Statement-1 : An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature.Statement-2 : Entropy of an exothermic reaction always decrease with decrease in temperature.a)Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1b)Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1c)Statement-I is false, statement-2 is true.d)Statement-1 is true, statement-2 is false.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Statement-1 : An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature.Statement-2 : Entropy of an exothermic reaction always decrease with decrease in temperature.a)Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1b)Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1c)Statement-I is false, statement-2 is true.d)Statement-1 is true, statement-2 is false.Correct answer is option 'C'. Can you explain this answer?.
Statement-1 : An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature.Statement-2 : Entropy of an exothermic reaction always decrease with decrease in temperature.a)Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1b)Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1c)Statement-I is false, statement-2 is true.d)Statement-1 is true, statement-2 is false.Correct answer is option 'C'. Can you explain this answer? for JEE 2024 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about Statement-1 : An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature.Statement-2 : Entropy of an exothermic reaction always decrease with decrease in temperature.a)Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1b)Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1c)Statement-I is false, statement-2 is true.d)Statement-1 is true, statement-2 is false.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for JEE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Statement-1 : An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature.Statement-2 : Entropy of an exothermic reaction always decrease with decrease in temperature.a)Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1b)Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1c)Statement-I is false, statement-2 is true.d)Statement-1 is true, statement-2 is false.Correct answer is option 'C'. Can you explain this answer?.
Solutions for Statement-1 : An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature.Statement-2 : Entropy of an exothermic reaction always decrease with decrease in temperature.a)Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1b)Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1c)Statement-I is false, statement-2 is true.d)Statement-1 is true, statement-2 is false.Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for JEE.
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ample number of questions to practice Statement-1 : An exothermic reaction, non-spontaneous at high temperature, may become spontaneous at low temperature.Statement-2 : Entropy of an exothermic reaction always decrease with decrease in temperature.a)Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1b)Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1c)Statement-I is false, statement-2 is true.d)Statement-1 is true, statement-2 is false.Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice JEE tests.
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