Borax is converted into crystalline boron by the following steps 

${B{orax}}\xrightarrow{X}{H_3}B{O_3}\xrightarrow{\Delta }{B_2}{O_3}\xrightarrow[\Delta ]{Y}B$,

$X$ and $Y$ are respectively

  • A

    $HCl, Mg$

  • B

    $HCl, C$

  • C

    $C, Al$

  • D

    $HCl, Al$

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