Question:
Which of the following enthalpy change is negative?
Which of the following enthalpy change is negative?
Show Hint
Heat is released when a vapour condenses, so the enthalpy change of condensation is negative.
Updated On: Nov 12, 2026
- Enthalpy of fusion
- Enthalpy of condensation
- Enthaly of vaporization
- Enthalpy of sublimation
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Processes that absorb heat are endothermic with positive \(\Delta H\).
Processes that release heat are exothermic with negative \(\Delta H\).
Step 2: Analyse Each Option
Fusion, vaporisation and sublimation need heat to overcome intermolecular forces, so their \(\Delta H\) is positive.
Condensation is the reverse of vaporisation, so heat is released.
Step 3: Compare the options
Only the enthalpy of condensation is negative, which is option (B).
Final Answer:
The enthalpy of condensation is negative. \[ \boxed{\text{(B) }\text{Enthalpy of condensation}} \]
Processes that absorb heat are endothermic with positive \(\Delta H\).
Processes that release heat are exothermic with negative \(\Delta H\).
Step 2: Analyse Each Option
Fusion, vaporisation and sublimation need heat to overcome intermolecular forces, so their \(\Delta H\) is positive.
Condensation is the reverse of vaporisation, so heat is released.
Step 3: Compare the options
Only the enthalpy of condensation is negative, which is option (B).
Final Answer:
The enthalpy of condensation is negative. \[ \boxed{\text{(B) }\text{Enthalpy of condensation}} \]
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 Enthalpy change Questions
- The enthalpy change for the reaction \( \text{C} + \text{O}_2 \rightarrow \text{CO}_2 \) is \( -393.5 \, \text{kJ/mol} \). What is the heat released when 2 moles of carbon react with excess oxygen?
- The enthalpy of formation for \( \text{H}_2(g) \), \( \text{O}_2(g) \), and \( \text{H}_2O(l) \) are 0, 0, and -285.8 kJ/mol, respectively. What is the enthalpy change for the following reaction: \[ \text{2H}_2(g) + \text{O}_2(g) \rightarrow 2\text{H}_2O(l) \]
- The enthalpy change for the reaction \( \text{N}_2(g) + 3\text{H}_2(g) \rightarrow 2\text{NH}_3(g) \) is \( -92.4 \, \text{kJ/mol} \). What is the enthalpy change when 4 moles of nitrogen react?
- The bond dissociation enthalpy of \(\text{H}_2\), \(\text{Cl}_2\) and HCl are \(434\), \(242\) and \(431\) kJ \(\text{mol}^{-1}\) respectively. Calculate the enthalpy of formation of HCl.
- \(\text{C}_2\text{H}_5\text{OH}(l)+3\text{O}_2(g)\rightarrow 2\text{CO}_2(g)+3\text{H}_2\text{O}(l)\)
The value of enthalpy change (\(\Delta H\)) for above reaction at \(27\,^{\circ}\text{C}\) is \(-1366.5\) kJ \(\text{mol}^{-1}\). Then value of internal energy change for the same reaction at this temperature will be
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