World's worst radioactive pollution was caused by nuclear reactor disaster which occured in

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World's worst radioactive pollution was caused by nuclear reactor disaster which occured in Answer: Chernobyl (undivided U.S.S.R.)

Question context

This question is part of ⚗️ Chemical Engineering within the broader 🛠️ Engineering Essentials subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.