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Name the process which takes place when:
i).Iodine changes directly from solid to gas
ii) `Fe^(2+)(aq)` changes to `Fe^(3+)(aq)`
iii) White sugar changes to black solid when mixed with excess concentrated Sulphuric (VI) acid

Answer Text:
i).Sublimation.
ii).Oxidation.
iii).Dehydration.