Colour of the bead in borax bead test is mainly due to the formation of
metal oxides
boron oxide
metal metaborates
elemental boron
Information (Borax bead: $NaBO_2 + B_2O_3$ )
$H_3BO_3$ $\xrightarrow{{{T_1}}}X\xrightarrow{{{T_2}}}Y\xrightarrow{{red\,hot}}$ $B_2O_3$
if $T_1 < T_2$ then $X$ and $Y$ respectively are
Explain ionization enthalpy and electro-negativity for elements of Boron family.
The incorrect order of $1^{st}$ $IP$ of the elements is
Assertion : Both $Be$ and $Al$ can form complexes such as $BeF_4^{2-}$ and $AlF_6^{3-}$ respectively, $BeF_6^{3-}$ is not formed. Reason : In case of $Be$, no vacant $d-$ orbitals are present in its outermost shell.
Which of the following compounds of boron does not exist in the free form
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