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Q.
In $1984$, the Bhopal gas tragedy took place because methyl isocyanate
ManipalManipal 2007
Solution:
Bhopal gas tragedy occurred ($3$ Dec $1984$) when MIC (Methyl Isocyanate) reacted with water in a tank, an exothermic chemical reaction started and producing a lot of heat. As a result, the safety valve of tank burst because of increase in pressure. It gave rise to a heavy gas which rapidly rank to the ground.