Chemistry
Which one of the following statement is correct ?Ozone is found in the earth's atmosphere mostly between

20 and 50 km
5 and 10 km
50 and 100 km
10 and 20 km

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Chemistry
Which of the process is known as nitrification?

Reaction of nitrogen dioxide with water to form nitric acid
Conversion of nitrite to nitric oxide
Conversion of ammonia to nitrites
Reaction of Nitrogen Monoxide with oxygen to form nitric acid

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