Question:
Identify from following physical transformations that exhibits decrease in entropy.
Identify from following physical transformations that exhibits decrease in entropy.
Show Hint
Entropy decreases when matter goes from a more disordered state to a more ordered one, such as gas to liquid.
Updated On: Nov 13, 2026
- \(\mathrm{H}_{2}\mathrm{O}_{(\mathrm{s})}\longrightarrow \mathrm{H}_{2}\mathrm{O}_{(l)}\)
- \(\mathrm{H}_{2}\mathrm{O}_{(l)}\longrightarrow \mathrm{H}_{2}\mathrm{O}_{(\mathrm{g})}\)
- \(\mathrm{H}_{2}\mathrm{O}_{(\mathrm{s})}\longrightarrow \mathrm{H}_{2}\mathrm{O}_{(\mathrm{g})}\)
- \(\mathrm{H}_{2}\mathrm{O}_{(\mathrm{g})}\longrightarrow \mathrm{H}_{2}\mathrm{O}_{(\ell )}\)
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Entropy measures disorder. Gas \(\gt\) liquid \(\gt\) solid in entropy.
Step 2: Check each change
Solid to liquid, liquid to gas and solid to gas all increase disorder, so entropy increases.
Step 3: Condensation
Gas to liquid, \(\text{H}_2\text{O}_{(g)} \rightarrow \text{H}_2\text{O}_{(l)}\), makes the molecules more ordered, so \(\Delta S\) is negative.
Final Answer:
Condensation of water vapour shows a decrease in entropy. \[ \boxed{\text{(D) }\text{H}_2\text{O}_{(g)}\longrightarrow\text{H}_2\text{O}_{(l)}} \]
Entropy measures disorder. Gas \(\gt\) liquid \(\gt\) solid in entropy.
Step 2: Check each change
Solid to liquid, liquid to gas and solid to gas all increase disorder, so entropy increases.
Step 3: Condensation
Gas to liquid, \(\text{H}_2\text{O}_{(g)} \rightarrow \text{H}_2\text{O}_{(l)}\), makes the molecules more ordered, so \(\Delta S\) is negative.
Final Answer:
Condensation of water vapour shows a decrease in entropy. \[ \boxed{\text{(D) }\text{H}_2\text{O}_{(g)}\longrightarrow\text{H}_2\text{O}_{(l)}} \]
Was this answer helpful?
0
0
Top MHT CET Chemistry Questions
- The temperature of $32^{\circ}C$ is equivalent to
- The heat of formation of water is $ 260\, kJ $ . How much $ H_2O $ is decomposed by $ 130\, kJ $ of heat ?
- If a metal crystallises in bcc structure with edge length of unit cell $4.29 \times 10^{-8}\, cm$ the radius of metal atom is
- Which of the following oxides can act both as an oxidising agent as well as reducing agent ?
- "The mass and energy both are conserved in an isolated system", is the statement of
View More Questions
Top MHT CET Spontaneity Questions
- Identify from following the correct set of thermodynamic conditions for the reaction to be spontaneous at all temperature.
- Identify from following the correct set of thermodynamic conditions for a reaction to be nonspontaneous at all temperatures.
- Which of the following processes has \(\Delta S\) negative?
- For a reaction to be spontaneous at all temperatures, the values of enthalpy change and entropy change should be
- What is the change in entropy of surrounding for the reaction,
\(\text{H}_{2(g)}+1/2 \text{O}_{2(g)}\rightarrow \text{H}_2\text{O}_{(l)}\)
at 298 K if standard enthalpy of formation of water is \(-286\) kJ ?
View More Questions
Top MHT CET Questions
- During r- DNA technology, which one of the following enzymes is used for cleaving DNA molecule ?
- In non uniform circular motion, the ratio of tangential to radial acceleration is (r = radius of circle, $v =$ speed of the particle, $\alpha =$ angular acceleration)
- The temperature of $32^{\circ}C$ is equivalent to
- The line $5x + y - 1 = 0$ coincides with one of the lines given by $5x^2 + xy - kx - 2y + 2 = 0 $ then the value of k is
- The heat of formation of water is $ 260\, kJ $ . How much $ H_2O $ is decomposed by $ 130\, kJ $ of heat ?
View More Questions