Na [B4O5(OH)4].8H2Oreacts with HCl  forms X and X is heated forms Y  and y react with Na forms Z  ...   determine  Z  ?    answer is B ( where B is boron ) plese write mechanism.......

Joshi sir comment

Borax + HCl --------------> H3BO3  + NaCl   + H2O

H3BO3  ----------------Heated---------->   B2O3   +   H2O

B2O3  +  Na   ---------------->    B  +  Na2O

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