$H_3BO_3$ $\xrightarrow{T_1} X$ $\xrightarrow{T_2} Y$ $\xrightarrow{\text{red hot}} B_2O_3$
If $T_1 < T_2$,then $X$ and $Y$ respectively are:

  • A
    $X = \text{Metaboric acid}, Y = \text{Tetraboric acid}$
  • B
    $X = \text{Tetraboric acid}, Y = \text{Metaboric acid}$
  • C
    $X = \text{Borax}, Y = \text{Metaboric acid}$
  • D
    $X = \text{Tetraboric acid}, Y = \text{Borax}$

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$II$. Diborane is prepared by the oxidation of sodium borohydride with iodine.
$III$. In diborane,the oxidation state of hydrogen is $+1$.
$IV$. Boric acid is a tribasic acid.

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