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Which is more basic oxide ion (O-2 ) or hydroxide ion( OH- ) and why ?

SOLUTION: The basic strength of base primarily depends on the ability of a species to attract H+, which is also depends upon electrostatic interactions. The smaller and more highly charged a negative species is, the stronger the attraction for the small, positive H+ ion. For example, O2- has a higher negative charge than OH-, and as a result it is a stronger base. One does not normally expect reactions that take place in aqueous solutions to produce oxides as a result of the basicity of O2-. Ionic oxides normally react with water to produce hydroxides:

                                           CaO + H2O → Ca(OH)2


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