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B
H2CO3
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C
HNO3
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D
H2SO4
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Solution
The correct options are BH2CO3 CHNO3 DH2SO4 Rain water has a pH of 5.6 due to the presence of H+ ions formed by reaction of rain water with carbon dioxide present in the atmosphere. H2O(l)+CO2(g)→H2CO3(aq) H2CO3(aq)→H+(aq)+HCO3(aq) When the pH of the rain water drops below 5.6, it is called acid rain. SO2 and NO2 after oxidation and reaction with water are major contributors to acid rain, 2SO2(g)+O2(g)+2H2O(l)→2H2SO4(aq)