JAMB - Chemistry (2018 - No. 62)
The presence of ammonia gas in a desiccator can exclusively be removed by
phosphorus (V) oxide
fused calcium chloride
calcium oxide
concentrated tetraoxosulphate (VI) acid
הֶסבֵּר
Ammonia gas can be removed from a dessicator by adding a conc. H2SO4 so as to neutralize it since ammonia gas is basic.