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
-
A.
distillation -
B.
sublimation -
C.
precipitation -
D.
evaporation -
E.
decomposition