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Question
Acid rain is known to contain some acids. Name these acids and where from they come in rain?
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Solution
Rainwater has a pH of 5.6 due to the presence of H+ ions formed by the reaction of rainwater with carbon dioxide present in the atmosphere. The reaction can be shown as-
\[\ce{H2O (l) + CO2 (g) -> H2CO3 (aq)}\]
\[\ce{H2CO3 (aq) -> H+ (aq) + HCO^{-}3 (aq)}\]
If the pH of the rainwater falls below 5.6 then it is known as acid rain. NO2 after oxidation and reaction with water are major contributors to the acid rain.
\[\ce{2SO2 (g) + O2 (g) + 2H2O (l) -> 2H2SO4 (aq)}\]
\[\ce{4NO2 (g) + O2 (g) + 2H2O (l) -> 4HNO^{-}3 (aq)}\]
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RELATED QUESTIONS
Explain tropospheric pollution in 100 words.
What would have happened if the greenhouse gases were totally missing in the earth’s atmosphere? Discuss.
Which of the following gases is not a green house gas?
The acids present in acid rain are:
(i) Peroxyacetylnitrate
(ii) H2CO3
(iii) HNO3
(iv) H2SO4
Green house effect leads to global warming. Which substances are responsible for green house effect?
Assertion (A): Green house effect was observed in houses used to grow plants and these are made of green glass.
Reason (R): Green house name has been given because glass houses are made of green glass.
Assertion (A): The pH of acid rain is less than 5.6.
Reason (R): Carbon dioxide present in the atmosphere dissolves in rain water and forms carbonic acid.
Assertion (A): Carbon dioxide is one of the important greenhouse gases.
Reason (R): It is largely produced by respiratory function of animals and plants.
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Match List - I with List - II.
| List - I | List - II | ||
|
(a) |
\[\ce{2SO2(g) + O2(g) -> 2SO3(g)}\] | (i) | Acid rain |
| (b) | \[\ce{HOCl(g) ->[hv] \overset{\bullet}{O}H + \overset{\bullet}{C}l}\] | (ii) | Smog |
| (c) | \[\ce{CaCO3 + H2SO4 -> CaSO4 + H2O + CO2}\] | (iii) | Ozone depletion |
| (d) | \[\ce{NO2(g) ->[hv] NO(g) + O(g)}\] | (iv) | Tropospheric pollution |
Choose the correct answer from the options given below.
The gas released during anaerobic degradation of vegetation may lead to ______.
Assertion (A): Ozone is destroyed by CFCs in the upper stratosphere.
Reason (R): Ozone holes increase the amount of UV radiation reaching the earth.
Thermal power plants can lead to ______.
