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
$HCl, Mg$
$HCl, C$
$C, Al$
$HCl, Al$
Which of the following is a non-metal
The weakest Lewis acid is
The crystalline form of borax has
($A$) tetranuclear $\left[\mathrm{B}_4 \mathrm{O}_5(\mathrm{OH})_4\right]^{2-}$ unit
($B$) all boron atoms in the same plane
($C$) equal number of $s p^2$ and $s p^3$ hybridized boron atoms
($D$) one terminal hydroxide per boron atom
Group $13$ elements show $+1$ and $+3$ oxidation states. Relative stability of $+3$ oxidation state may be given as
$Be ( OH )_2$ react with $Sr ( OH )_2$ to yield an ionic salt. Choose the incorrect option related to this reaction from the following: