$N{a_2}{B_4}{O_7}.10{H_2}O\xrightarrow{{Heat}}X + NaB{O_2} + {H_2}O,X + C{r_2}{O_3}\xrightarrow{{Heat}}\mathop Y\limits_{\left( {Green\,coloured} \right)} $ $X$ and $Y$ are

  • A

    $Na_3BO_3$ and $Cr(BO_2)_3$

  • B

    $Na_2B_4O_7$ and $Cr(BO_2)_3$

  • C

    $B_2O_3$ and $Cr(BO_2)_3$

  • D

    $B_2O_3$ and $CrBO_3$

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