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Yes, ZnSO4 can act as a Lewis acid, although it is less common than ZnCl2. Both ZnSO4 and ZnCl2 have a vacant orbital on the zinc atom, which allows them to accept an electron pair from a Lewis base. However, ZnCl2 is generally a stronger Lewis acid because the chloride ions are better at withdrawing electron density from the zinc atom, making it more electrophilic.