Which of the following produce an alkaline solution when dissolved in water?
$(i)$ Borax
$(ii)$ Potash alum
$(iii)$ $SO_2$
$(iv)$ $SO_2(OH)_2$

Which of the following statements is correct regarding boron hydrides?

Which one of the following statements is not correct?

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.

When a mixture of diborane and ammonia is heated,the final product is:

In group $13$ of the long form of the periodic table,an element $X$ has a boiling point of $T_2 \ (K)$ and a melting point of $T_1 \ (K)$. Identify the element $X$ for which $T_2 - T_1 \ (K)$ is maximum.