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The number of correct statements are
1) smoke - particulate air pollutant
2) smoke - mixture of solid and liquid particles
3) PAN - powerful eye irritant
4) classical smog contains NO₂
5) Plants like pinus, juniparus , pyrus, controlls NO
6) CO₂is poisonous

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answer is 4.

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Detailed Solution

1) smoke - particulate air pollutant
2) smoke - mixture of solid and liquid particles
3) PAN - powerful eye irritant
5) Plants like Pinus, Juniperus, Pyrus, controls NO

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