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Sulfuric acid, for instance could be separated into H+ and HSO4– ions. A strong electric field could accelerate the heavy anions backward to generate thrust (and the light cations would go forward).
I would think that the higher the charge to mass ratio, the more velocity one could impart on the ions. Assuming Energy is cheap, and matter to expel is expensive (plus the weight of carrying and accelerating the unused propellant), then one would absolutely want to maximize the velocity the ions are being expelled at.
Can one ionize H2 ==> H+ + H−