Chemistry
Give reasons for the following.
Natural rain water does not have a pH of 7 [i.e. neutral]
Pollution
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Answer
Natural rain water produced in unpolluted air is slightly acidic as CO2 present in traces in unpolluted air dissolves in rain water forming weak carbonic acid [H2CO3].
H2O + CO2 ⟶ H2CO3 [carbonic acid]
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Related Questions
Select the correct answer from the choice A, B, C given in each case.
The major pollutant released during burning of fossil fuels.
A: Carbon monoxide B: Sulphur dioxide C: Hydrogen sulphideThe green house gas which on combustion produces another green house gas.
A: Nitrous oxide B: Ozone C: MethaneThe gas which in presence of U.V. light gives two atoms of the same gas.
A: Oxygen B: Ozone C: Carbon dioxideA chemical responsible for ozone depletion.
A: Methyl acetylene B: Methyl chloride C: MethanolA renewable source of energy which causes minimum or no pollution.
A: Fossil fuel B: L.P.G. C: Hydro power.
Give balanced equations for the following conversions [one or two steps].
- Sulphur trioxide to sulphuric acid – a constituent of acid rain.
- Nitrogen to nitrogen dioxide – in an internal combustion engine.
- Methane to carbon dioxide – a green house gas.
- A molecule of ozone to two molecules of oxygen gas.
- Oxygen to ozone gas by photolysis.
Give reasons for the following.
A catalytic converter in an internal combustion engine reduces pollution.
Give reasons for the following.
In absence of green house gases the surface temperature of the earth is maintained.