White crystalline compound (X) reacts wi...

White crystalline compound (X) reacts with water to produce an alkaline solution. On heating it produce a transparaent bead which on heating with `CuSO_(4)` form a blue colour bead Y. Compound X on heating with ethanol and `H_(2)SO_(4)` give green edged flame. Compound X dissolved in `NaOH` but when conc. `H_(2)SO_(4)` is added white crystals of an acid (Z) separate out.
The compound X is

`Na_(2)[B_(4)O_(5)(OH)_(4)].8H_(2)O`

`NaBO_(2)`

`Na_(2)[B_(4)O_(7)(OH)_(8)]`

`H_(3)BO_(3)`

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