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

Identify the compound A, X and Z in the following.
`A+2HCl+5H_2O to 2NaCl+X`

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`frac {Na_2B_4O_7}{(A)}+2HCl+5H_2O to 4H_3underset (X) BO_3+2NaCl`
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PATHFINDER-SOME P-BLOCK ELEMENTS-QUESTION BANK
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