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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Solution

(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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