Discussion
In the following phase diagram, the process corresponding to sublimation is :
Answer: B
Sublimation corresponds to I → III.
In this pressure-temperature diagram region I, at low temperature beside the steep fusion line, is the solid; region II, above the vaporisation curve, is the liquid; and region III, at high temperature and low pressure, is the gas. The three lines meet at the triple point.
Sublimation is the direct change from solid to gas, crossing the short sublimation line below the triple point, so it is I → III. I → II is melting, II → III is vaporisation, and III → II is condensation.
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