schoolscienceproject.blogspot.in
Bleached rose
A piece of
sulphur is ignited in a jam jar. Since a pungent vapour is produced, you should
do the experiment out-of-doors. Hold a red rose in the jar. The colour of the
flower becomes visibly paler until it is white. When sulphur is burned, sulphur
dioxide is formed. As well as its germicidal action in sterilisation, the gas
has a bleaching effect, and the dye of the flower is destroyed by it. Sulphur
dioxide also
destroys the
chlorophyll of plants, which explains their poor growth in industrial areas,
where the gas pollutes the air.
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