The p-Block Elements — Chemistry STD 12 Science — Question
Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe p-Block Elements3 Marks
Question
How is $SO_2$ an air pollutant?
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Answer
$SO_2$ dissolves in moisture present in air to form $H_2SO_4$ which damages building materials especially marble $($acid - rain$)$.
$-\text{CaCO}_3+\text{H}_2\text{SO}_3\rightarrow\text{CaSO}_3+\text{H}_2\text{O}+\text{CO}_2$
1t corrodes metals like Fe and steel. It also brings about fading and deterioration of fabrics, leather, paper, etc., and affecting the colour of paints.
Even in low concentration $(= 0.03$ ppm$),$ it has damaging effect on the plants. If exposed for a long time, i.e., a few days or weeks, it slows down the formation of chlorophyll i. e., loss of green colour. This is called chlorosis.
1t is strongly irritating to the respiratory track. It cause throat and eye irritation, resulting into cough, tears and redness in eyes. It also cause breathlessness and effects larynx i. e., voice box.
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