The enthalpy change for the process
C_(graphite) = C_(g) ; $∆$ H = +x KJ represents enthalpy of

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Vapourisation

Sublimation

Combustion

Fusion

answer is B.

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Detailed Solution

Enthalpy of sublimation is enthalpy change taking place when1 mole of solid is directly converting into gaseous state without converting into liquid state.

It is always endothermic process and is equal to sum of the enthalpy of fusion and enthalpy of vaporization,both at same tempertature.

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