S

Shyam Dubey • 3.70K Points
Extraordinary

Q. Which of the following processes is endothermic?

  • (A) Freezing of water
  • (B) Condensation of steam
  • (C) Sublimation of dry ice (CO2 solid → gas)
  • (D) Formation of ionic lattice from gaseous ions
  • Correct Answer - Option(C)
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  • Filed under category Chemistry
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Explanation by: Shyam Dubey
Sublimation (solid to gas) requires input of energy — it's endothermic. Freezing and condensation release heat (exothermic). Formation of an ionic lattice from gaseous ions (lattice formation) releases energy (exothermic lattice energy). Hence sublimation is the correct endothermic process among the options.

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