JAMB - Chemistry (1978 - No. 5)
A small quantity of solid ammonium chloride (NH4Cl) was heated gently in a test tube, the solid gradually disappears to produce two gases. Later, a white cloudy deposit was observed on the cooler part of the test tube. The ammonium chloride is said to have undergone?
distillation
sublimation
precipitation
evaporation
decomposition
คำอธิบาย
Sublimation is the transition of a substance directly from the solid phase to the gas phase without passing through the intermediate liquid phase