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Grade: 10
        
The neutralization of a solution of 1.2 g of a substance containing a mixture of H2 C2 O4 .2H2 O, KHC2 O4 .H2 O and different impurities of a neutral salt consumed 18.9 mL of 0.5 N NaOH solution. On titration with KMnO4 solution, 0.4 g, of the same substance needed 21.55 mL of 0.25 N KMnO4. Calculate the % composition of the substance. 
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