Borax is converted into crystalline boron by the following steps:
$Borax$ $\xrightarrow{X} H_3BO_3$ $\xrightarrow{\Delta} B_2O_3$ $\xrightarrow[\Delta]{Y} B$
$X$ and $Y$ are respectively:

  • A
    $HCl, Mg$
  • B
    $HCl, C$
  • C
    $C, Al$
  • D
    $HCl, Al$

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The set in which compounds have different nature is:

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