Identify the compounds A, X and Z in the following reactions.

A+2HCl+5H2O2NaCl+X

X370KHBO2370KZ


(i) Na2B4O7Borox(A)+2HCl+5H2O2NaCl+4H3BO3Orthobodircacid(X)
(ii) H3BO3370KHBO2Metaboricacid+H2O
(iii) 4HBO2H2O370K[H2B4O7]Tetraboric
acidHeatRed3B2O2+H2OBorontrioxide(Z)