In Hall’s process, the main reagent is mixed with

Write balanced equations for:

$(i)$ $BF _{3}+ LiH \rightarrow$

$(ii)$ $B _{2} H _{6}+ H _{2} O \rightarrow$

$(\text { iii }) NaH + B _{2} H _{6} \rightarrow$

$(i v) H_{3} B O_{3} \stackrel{\Delta}{\longrightarrow}$

$( v ) Al + NaOH \rightarrow$

$( v i ) B _{2} H _{6}+ NH _{3} \rightarrow$

Heating an aqueous solution of aluminium chloride to dryness will give:

The hardest substance amongst the following is

For the electrolytic production of aluminium, $(i)$ the cathode and $(ii)$ the anode are made of

Which match is not incorrect ?