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Identify the compound A, X and Z in the ...

Identify the compound A, X and Z in the following reactions:
(i) `A+2HCl+5H_(2)Orarr2NaCl+x` (ii) `Xunderset(370k)overset(Delta)rarrHBO_(2)underset(gt370k)overset(Delta)rarrZ`

Text Solution

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(i) `underset("Borax (A)")(Na_(2)B_(4)O_(7))+2HCl+5H_(2)Orarr2NaCl+underset("Orthoboric acid (X)")(4H_(3)BO_(3))`
(ii) `H_(3)BO_(3)overset(Delta,370K)(rarr) underset("Metaboric acid")(HBO_(2))+H_(2)O`
(iii) `4HBO_(2) underset(-H_(2)O)overset(Delta gt370K)(rarr)underset("Tetraboric acid")([H_(2)B_(4)O_(7)])underset("Heat")overset("Red")(rarr)underset("Boron trioxide (Z)")(2B_(2)O_(3)+H_(2)O)`
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