JAMB - Chemistry (1980 - No. 35)
In the above experiment X is?
pure nitrogen
a mixture of nitrogen and oxygen
a mixture of nitrogen and carbondioxide
a mixture of oxygen and inert gases
a mixture of nitrogen and inert gases
Spiegazione
Alkaline solutions of pyrogallol absorb oxygen efficiently and are used in determining the oxygen content of gas mixtures.
calcium chloride absorbs sufficient moisture/water from the air.
So,Nitrogen and Inert gases will be left