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One g of a mixture of Na2CO3 and NaHCO3 consumes y equivalent of HCl for complete neutralisation. One g of the mixture is strongly heated, then cooled and the residue treated with HCl. How many equivalent of HCl would be required for complete neutralisation?

(a) 2y equivalent

(b) y equivalent

(c)  3y/4 equivalent

(d) 3y/2 equivalent