In diborane,the $H-B-H$ bond angle is $120^o$. The hybridization of boron is likely to be

Which of the following processes is used to prepare borazine?

When an excess of $NaOH$ solution is added to a solution of potassium alum,what do we obtain?

The correct orders among the following are
$A$. Atomic radius $: B < Al < Ga < In < Tl$
$B$. Electronegativity $: Al < Ga < In < Tl < B$
$C$. Density $: Tl < In < Ga < Al < B$
$D$. $1^{st}$ Ionisation Energy $: In < Al < Ga < Tl < B$
Choose the correct answer from the options given below $:$

Identify the correct statements:
$i$. Oxidation of $NaBH_4$ with $I_2$ gives $B_2H_6$
$ii$. $B_2H_6$ burns in oxygen and releases an enormous amount of energy
$iii$. $B_2H_6$ on hydrolysis gives a tribasic acid

Which of the following on hydrolysis produces diborane $(B_2H_6)$?