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How is boron obtained from borax ? Give ...

How is boron obtained from borax ? Give the chemical reactions involved. Draw the structure of `B_(2)H_(6)` and give its reaction with `HCl`.

Text Solution

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`underset("Borax")(Na_(2)B_(4)O_(7))*10H_(2)O+H_(2)SO_(4)("conc.")toNa_(2)SO_(4)+underset("Tetraboric acid")(H_(2)B_(4)O_(7))+10H_(2)O`
`H_(2)B_(4)O_(7)+5H_(2)O to underset("Boric acid")(4H_(3)BO_(3))`
`2H_(3)BO_(3) overset("Red heat")tounderset("Boric oxide")(B_(2)O_(3))+6H_(2)O`
`B_(2)O_(3)+3Mg overset(Delta)to2B+3MgO`
Structure of `B_(2)H_(6)`

`underset(("Diborane"))(B_(2)H_(6))+HCl overset(AlCl_(3))to underset("Chlorodiborane")(B_(2)H_(5)Cl)+H_(2)`
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