Answer:
\[S{{O}_{2}}\] is the most
serious gaseous pollutants. On combustion of coal in the factories, \[S{{O}_{2}}\]
is released as coal contains 0.1 to 6% of sulphur.
\[S+{{O}_{2}}\to S{{O}_{2}}\]
\[S{{O}_{2}}\]is also produced
when sulphide ores are roasted in air during extraction of metals.
\[2Fe{{S}_{2}}+5\,{{O}_{2}}\to
5FeO+4S{{O}_{2}}\]
\[2C{{u}_{2}}S+3{{O}_{2}}\to
6Cu+3S{{O}_{2}}\]
\[S{{O}_{2}}\]is
highly irritating gas to respiratory tract of human beings. Even at low
concentration (about 5 ppm) it causes drying of mouth, throat and eye
irritation. It brings breathlessness and affects voice box. Higher
concentration may cause lung disease and even lung cancer.
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