JAMB - Chemistry (2015 - No. 5)
The gas that is most useful in protecting humans against solar marathon is
chlorine
ozone
carbon IV oxide
hydrogen sulphide
Vysvetlenie
The ozone layer or ozone shield refers to a region of Earth's stratosphere that absorbs most of the Sun's ultraviolet (UV) radiation. It contains high concentrations of ozone (O3) relative to other parts of the atmosphere, although still very small relative to other gases in the stratosphere