Question:
Which from following transformations is endothermic in nature?
Which from following transformations is endothermic in nature?
Show Hint
A change that needs heat input, such as breaking intermolecular attractions, is endothermic.
Updated On: Nov 13, 2026
- \(\mathrm{H}_{2}\mathrm{O}_{(\ell )}\rightarrow \mathrm{H}_{2}\mathrm{O}_{(\mathrm{s})}\)
- \(\mathrm{H}_{2}\mathrm{O}_{(\mathrm{s})}\rightarrow \mathrm{H}_{2}\mathrm{O}_{(\ell )}\)
- \(\mathrm{H}_{2}\mathrm{O}_{(\mathrm{g})}\rightarrow \mathrm{H}_{2}\mathrm{O}_{(\ell )}\)
- \(\mathrm{H}_{2}\mathrm{O}_{(\mathrm{g})}\rightarrow \mathrm{H}_{2}\mathrm{O}_{(\mathrm{s})}\)
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
Processes that absorb heat from the surroundings are endothermic.
Freezing and condensation release heat, while melting, vaporisation and sublimation absorb heat.
Step 2: Check the options
Liquid to solid is freezing, exothermic.
Solid to liquid is melting (fusion), endothermic.
Gas to liquid is condensation and gas to solid is deposition, both exothermic.
Step 3: Conclude
Only the melting of ice, \(\text{H}_2\text{O(s)} \rightarrow \text{H}_2\text{O}(\ell)\), is endothermic.
Final Answer:
Melting of ice is the endothermic change. \[ \boxed{\text{(B) }\text{H}_2\text{O}_{(s)}\rightarrow \text{H}_2\text{O}_{(\ell)}} \]
Processes that absorb heat from the surroundings are endothermic.
Freezing and condensation release heat, while melting, vaporisation and sublimation absorb heat.
Step 2: Check the options
Liquid to solid is freezing, exothermic.
Solid to liquid is melting (fusion), endothermic.
Gas to liquid is condensation and gas to solid is deposition, both exothermic.
Step 3: Conclude
Only the melting of ice, \(\text{H}_2\text{O(s)} \rightarrow \text{H}_2\text{O}(\ell)\), is endothermic.
Final Answer:
Melting of ice is the endothermic change. \[ \boxed{\text{(B) }\text{H}_2\text{O}_{(s)}\rightarrow \text{H}_2\text{O}_{(\ell)}} \]
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