Question:
Which of the following statement is incorrect?}
Which of the following statement is incorrect?}
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Formation of stable ionic solids such as \(CaCO_3\) is usually exothermic because energy is released during bond formation.
Updated On: Apr 24, 2026
- Melting of a solid is endothermic, so all enthalpies of fusion are positive.
- The magnitude of enthalpy change depends on the strength of the intermolecular interactions in the substance undergoing the phase transformations.
- Sublimation is a direct conversion of a solid into its vapour.
- The formation of calcium carbonate from calcium oxide and carbon dioxide is an endothermic reaction.
- The reference state of an element is its most stable state of aggregation at 25\(^\circ\)C and 1 bar pressure.
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The Correct Option is D
Solution and Explanation
Check each statement:
- (A) is correct. Melting needs energy, so enthalpy of fusion is positive.
- (B) is correct. Stronger intermolecular forces need more energy.
- (C) is correct. Sublimation means solid to vapour directly.
- (D) is incorrect because the formation of calcium carbonate from calcium oxide and carbon dioxide is an exothermic reaction.
- (E) is correct.
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