Which of the following statements about photochemical smog is wrong?
(i) It has high concentration of oxidising agents.
(ii) It has low concentration of oxidising agent.
(iii) It can be controlled by controlling the release of NO2 , hydrocarbons, ozone etc.
(iv) Plantation of some plants like pinus helps in controlling photochemical smog.

Answer: (ii)
 Photochemical smog is characterized by a high concentration of oxidizing agents, such as ozone (O3), nitrogen dioxide (NO2), and peroxyacyl nitrates (PANs). These compounds are formed by the reaction of sunlight with pollutants such as nitrogen oxides (NOx) and volatile organic compounds (VOCs).
One of the ways to control photochemical smog is to control the release of primary precursors such as NO2 and hydrocarbons, which can react with sunlight to form secondary precursors such as ozone and PANs. This can be done by using catalytic converters in automobiles, reducing the use of fossil fuels, and promoting the use of public transportation.
Also, Certain plants, such as Pinus, Juniparus, Quercus, Pyrus, and Vitis, can metabolize nitrogen oxide and therefore help in controlling photochemical smog. This is because these plants can absorb and break down pollutants such as NOx and VOCs, which are the primary precursors of photochemical smog.
Therefore, the correct answer is option (ii), which states that photochemical smog has a low concentration of oxidizing agent. This is incorrect, as photochemical smog is characterized by a high concentration of oxidizing agents.

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