When a solid substance disappears completely as a gas on heating; the substance is said to have undergone? by Sunday | Oct 14 | Chemistry JAMB | 0 comments A. evaporation B. distillation C. crystallization D. sublimation Correct Answer: Option D – sublimation Users Also Read These:An unproductive animal completely removed from the…When a substance changes directly from the solid…A 90W immersion heater is used to supply energy for…A heating coil rated 1000W is used to boil off…The half life of a radioactive substance is 14 days.…