The formula weight of an acid is 82. In a titration , 100 cc of a solution of this acid containing 39 gram of the acid per litre were completely neutralised by 95 cc of aqueous NaOH containing 40 gram NaOH per litre .What is the basicity of the acid ?
(a) 1
(b) 2
(c) 3
(d) 4
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