0.05 equivalent of H3PO4 is neutralized by : . (a)0.05 equivalent of NaOH.
(b) 0.05 mol Al(OH)3.
(c) both are correct

0.05 equivalent of H3PO4 needs 0.05 equivalent of Al(OH)3. H3PO4 is a tribasic acid. So, one equivalent needs three OH- to neutralise it. NaOH is a monoacidic base. So, 0.05 equivalent would not be enough to neutralise it completely whereas Al(OH)3  is a triacidic base. 

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