JAMB - Chemistry (1981 - No. 3)
When glowing splint is inserted into the mouth of a jar containing a gas, the splint is extinguished. The gas gives a white precipitate when passing into barium hydroxide. The gas is?
methane
hydrogen chloride
hydrogen
nitrogen
carbondioxide
解释
Co2 does not support combustion, it is used in fire extinguishers and when it is passed into a solution of barium hydroxide, a white precipitate of barium carbonate is formed