All of the following substances can act as Lewis acids except:
Correct answer: D. H2O
- A. BF3
- B. H+
- C. AlCl3
- D. H2O
Explanation
All the given options, BF3, H+, AlCl3, and H₂O, can act as Lewis acids since they can accept electron pairs. However, in H₂O, the oxygen atom is already sharing its two lone pairs of electrons with two hydrogen atoms, so it cannot accept more electrons easily and hence cannot act as a Lewis acid easily. So the best possible answer is D) water.
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About Reversible Reactions
A reversible reaction proceeds in both forward and backward directions, so reactants and products continue changing until dynamic equilibrium is established. The topic covers the meaning of equilibrium, the equality of forward and reverse rates, and how concentration, pressure and temperature disturb equilibrium, which is separate from the rate at which equilibrium is reached.
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