Doubt from ATP

Can anyone tell me where in ncert is this?

D is the answer. It is in syllabus of class 9 or below. But here it is just as general knowledge.

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Yes, it's in class 9th Ncert.

I think it was earlier written in environmental chemistry chapter now it doesn't exist

There is also a question on gas leakage in Bhopal gas tragedy..
These type of questions haven't reappeared.

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