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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 Z is

A

`HBO_(2)`

B

`H_(3)BO_(3)`

C

`Na_(2)SO_(4)`

D

`NaB(SO_(4))_(2)`

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The correct Answer is:
B
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