Question:
Which of the following processes has \(\Delta S\) negative?
Which of the following processes has \(\Delta S\) negative?
Show Hint
Entropy falls when the disorder of the system decreases, such as a gas being held on a solid surface.
Updated On: Oct 1, 2026
- Dissolving Sugar in Water
- Adsorption of a Gas on a Solid Surface
- \(2\text{NH}_3(g)\rightarrow \text{N}_2(g)+3\text{H}_2(g)\)
- Sublimation of Dry Ice
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Entropy measures disorder. A process that makes the system more ordered has \(\Delta S < 0\).
Step 2: Check option (A).
Sugar dissolving in water spreads out the sugar molecules, so disorder increases and \(\Delta S > 0\).
Step 3: Check option (B).
In adsorption a gas molecule that moved freely gets held on a surface. Its freedom drops, so \(\Delta S < 0\).
Step 4: Check option (C).
\(2\text{NH}_3 \to \text{N}_2 + 3\text{H}_2\) increases gas moles from 2 to 4, so \(\Delta S > 0\).
Step 5: Check option (D).
Sublimation of dry ice turns a solid into a gas, a huge rise in disorder, so \(\Delta S > 0\).
Final Answer:
Only adsorption of a gas on a solid has a negative \(\Delta S\), option (B). \[ \boxed{\text{(B)}} \]
Entropy measures disorder. A process that makes the system more ordered has \(\Delta S < 0\).
Step 2: Check option (A).
Sugar dissolving in water spreads out the sugar molecules, so disorder increases and \(\Delta S > 0\).
Step 3: Check option (B).
In adsorption a gas molecule that moved freely gets held on a surface. Its freedom drops, so \(\Delta S < 0\).
Step 4: Check option (C).
\(2\text{NH}_3 \to \text{N}_2 + 3\text{H}_2\) increases gas moles from 2 to 4, so \(\Delta S > 0\).
Step 5: Check option (D).
Sublimation of dry ice turns a solid into a gas, a huge rise in disorder, so \(\Delta S > 0\).
Final Answer:
Only adsorption of a gas on a solid has a negative \(\Delta S\), option (B). \[ \boxed{\text{(B)}} \]
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.
- 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 ?
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