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Enthalpy of sublimation of a substance i...

Enthalpy of sublimation of a substance is equal to :

A

Enthalpy of fusion + enthalpy of vaporisation

B

Enthalpy of fusion

C

Enthalpy of vaporisation

D

Twice the enthalpy of vaporisation

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The correct Answer is:
A
Enthalpy of sublimation of a substance is equal to enthalpy of fusion + enthalpy of vaporisation Sublimation is direct conversion of solid to vapour, solid `rarr` vapour
Writing in two step, we have solid `rarr` liquid `rarr` vapour
Solid `rarr` liquid requires enthalpy of fusion
Liquid `rarr` vapour requires enthalpy of vaporisation.
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