Dear student,
Generally there are 2 questions from environmental chemistry each year in jee mains. However since the pattern of jee mains had changed, therefore there could be a change in the number of questions that can come from environmental chemistry. However students can expect that 2-3 questions will definitely come from it.
You can check the weightage of each topic in jee mains from the following link:
https://engineering.careers360.com/articles/jee-main-syllabus-weightage

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