Question:
Identify the direction/process in which the entropy decreases
Identify the direction/process in which the entropy decreases
Show Hint
Entropy decreases when a system becomes more ordered, such as:
\[
\text{Gas}\rightarrow\text{Liquid}\rightarrow\text{Solid}
\]
Updated On: Jun 25, 2026
- \(H_2O(l) \longrightarrow H_2O(s)\)
- \(H_2O(l) \longrightarrow H_2O(g)\)
- \(H_2O(g) \longrightarrow 2H(g)\)
- \(\text{Crystal }(100\ K)\longrightarrow \text{Crystal }(200\ K)\)
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The Correct Option is A
Solution and Explanation
Step 1: Understand entropy.
Entropy is the measure of randomness or disorder of a system.
Higher randomness means higher entropy.
Step 2: Analyze option (1).
\[ H_2O(l)\longrightarrow H_2O(s) \] This represents freezing of water.
Liquid water has more randomness than solid ice.
During freezing, molecules become more ordered.
Hence, entropy decreases.
Step 3: Analyze remaining options.
\[ H_2O(l)\longrightarrow H_2O(g) \] Liquid changing to gas increases randomness.
Hence, entropy increases.
\[ H_2O(g)\longrightarrow 2H(g) \] Number of gaseous particles increases, so entropy increases.
\[ \text{Crystal }(100K)\longrightarrow \text{Crystal }(200K) \] Increase in temperature increases molecular motion and disorder.
Hence, entropy increases.
Step 4: Final conclusion.
Therefore, entropy decreases only in \[ \boxed{H_2O(l)\longrightarrow H_2O(s)} \]
Entropy is the measure of randomness or disorder of a system.
Higher randomness means higher entropy.
Step 2: Analyze option (1).
\[ H_2O(l)\longrightarrow H_2O(s) \] This represents freezing of water.
Liquid water has more randomness than solid ice.
During freezing, molecules become more ordered.
Hence, entropy decreases.
Step 3: Analyze remaining options.
\[ H_2O(l)\longrightarrow H_2O(g) \] Liquid changing to gas increases randomness.
Hence, entropy increases.
\[ H_2O(g)\longrightarrow 2H(g) \] Number of gaseous particles increases, so entropy increases.
\[ \text{Crystal }(100K)\longrightarrow \text{Crystal }(200K) \] Increase in temperature increases molecular motion and disorder.
Hence, entropy increases.
Step 4: Final conclusion.
Therefore, entropy decreases only in \[ \boxed{H_2O(l)\longrightarrow H_2O(s)} \]
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