Caustic chemical compound NYT Mini Crossword July 31 answer and hints

Another NYT Mini Crossword daily, another science clue—this time for the July 31 edition of the puzzle: “Caustic chemical compound.”

This side of trivia isn’t my strong suit, nor is it for many, I would guess. This makes the “caustic chemical compound” clue a tough task, but there is a science behind it.

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