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Which of the following is not a Lewis acid?(a) aluminium chloride(b) sodium ion(c) sulphur tetrafluoride(d) hydroxide ionThis question was addressed to me in an online quiz.My question is taken from Equilibrium topic in division Equilibrium of Chemistry – Class 11

Answer»

Right answer is (d) hydroxide ion

Easiest explanation: Lewis acids are molecules with an incomplete octet of CENTRAL ATOMS like ALUMINIUM CHLORIDE, simple CATIONS like sodium ion, and molecules in which the central atom has vacant d-orbital like sulphur tetrafluoride, but hydroxide ion is a negatively charged species. So it is not a Lewis acid.



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