Inorganic graphite is

Which of the following is the weakest acid?

In the following reaction,assign the nature of the product formed by the complete hydrolysis of the underlined atom at $R.T.$:
$H_4\underline{P}_2O_5 + H_2O \longrightarrow \text{Products}$

Write balanced equations for :
$(i) \, BF_{3} + LiH \to $
$(ii) \, B_{2}H_{6} + H_{2}O \to $
$(iii) \, NaH + B_{2}H_{6} \to $
$(iv) \, H_{3}BO_{3} \xrightarrow{\Delta }$
$(v) \, Al + NaOH \to $
$(vi) \, B_{2}H_{6} + NH_{3} \to $

White fumes appear around the bottle of anhydrous aluminium chloride. Give reason.

Which of the following sublimes on heating?