Identify the correct sets:
$i$. Boron fibres - bullet proof vest
$ii$. Metal borides - protective shields
$iii$. Borax - glass wool
Correct option is

Kernite and cryolite are the minerals of two elements $X$ and $Z$. Respectively $X$ and $Z$ are

Which one of the following forms a basic oxide?

Given below are the statements about diborane.
$(a)$ Diborane is prepared by the oxidation of $NaBH_{4}$ with $I_{2}$.
$(b)$ Each boron atom is in $sp^{2}$ hybridized state.
$(c)$ Diborane has one bridged $3$ centre$-2-$electron bond.
$(d)$ Diborane is a planar molecule.
The option with correct statement$(s)$ is :

The correct statements about the compounds of boron are:
$I$. In borax bead test, the colour of cobalt metaborate is blue.
$II$. 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.

The dissolution of $Al(OH)_3$ by a solution of $NaOH$ results in the formation of