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Atmospheric Pollution — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYAtmospheric Pollution3 Marks
Question
Explain the effect of sulphur dioxide on the atmosphere.
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Answer

Harmful effects of oxides of sulphur:
It causes headaches, vomiting and even death due to respiratory failure.
It destroys vegetation and weakens building materials/constructions.
It mixes with smoke and fog to form smog, which is very harmful.
It is oxidised by atmospheric oxygen into sulphur trioxide ($SO_3$​​​​​​​) which combines with water to form sulphuric acid ($H_2SO_4​​​​​​​$​​​​​​​). Sulphuric acid is the cause of acid rain.
$2SO_{2(g)} + O_{2(g)}→ 2SO_{3(g)} SO_{3(g)}+ H_2O →H_2SO_{4(aq)}​​​​​​​$​​​​​​​

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