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Adding water to a concentrated acid, instead of acid to water, is dangerous because

Question
Adding water to a concentrated acid, instead of acid to water, is dangerous because
It cools the mixture too quickly
The heat generated may cause the mixture to splash out and cause burns
It forms a harmless precipitate
It neutralises the acid instantly
Answer
The heat generated may cause the mixture to splash out and cause burns
Detailed Explanation
Local heating near the water surface can cause dangerous splashing and burns.
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