Question:
Which of the following statements regarding spontaneous process is NOT true?
Which of the following statements regarding spontaneous process is NOT true?
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Spontaneous changes are one-way under the given conditions; reversing them needs outside work.
Updated On: Nov 12, 2026
- It occurs of its own.
- It proceeds in both directions even in absence of external stimulant.
- Spontaneity is not concerned with rate of reaction.
- It continues till equilibrium is reached.
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
A spontaneous process takes place on its own under given conditions, without continuous outside help.
Step 2: Check each statement
A: true, it occurs of its own.
C: true, spontaneity is a thermodynamic idea and says nothing about the rate.
D: true, it continues until equilibrium is reached.
Step 3: The false statement
B says the process runs in both directions without any external agency. A spontaneous process is one-way; its reverse needs external work.
Final Answer:
The statement that a spontaneous process proceeds in both directions without an external agency is not true. \[ \boxed{\text{(B) }\text{It proceeds in both directions even in absence of external stimulant.}} \]
A spontaneous process takes place on its own under given conditions, without continuous outside help.
Step 2: Check each statement
A: true, it occurs of its own.
C: true, spontaneity is a thermodynamic idea and says nothing about the rate.
D: true, it continues until equilibrium is reached.
Step 3: The false statement
B says the process runs in both directions without any external agency. A spontaneous process is one-way; its reverse needs external work.
Final Answer:
The statement that a spontaneous process proceeds in both directions without an external agency is not true. \[ \boxed{\text{(B) }\text{It proceeds in both directions even in absence of external stimulant.}} \]
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