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1. $Al(NO_{3})_{3}$
Reason: For being a Lewis acid
Why blacklist: Can showed as an acid using universal indicator but formed a precipitate in the chem practical for yr 11. Confused the hell out of me, and caused me to lose marks in what would otherwise be an almost perfect assessment.
Why blacklist: It turns out that the substance in that funny chem yr 12 redox test was not infact $ClO_{2}^{-}$, but $ClO_{2}$. This caused me to get the multi choice question wrong. I am in eternal anger and pain. Furthermore, WHY DOES $ClO_{2}$ EXIST? WHY DOES CHLORINE HAVE AN OXIDATION NUMBER OF +4 WHAT THE HELL
