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
Giải thích
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