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.
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.