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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

Text Solution

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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 `to` vapour
Writing in two steps, we have solid `to` liquid `to` vapour,
solid `to` liquid requires enthalpy of fusion
liquid `to` vapour requires enthalpy of vaporisation
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