Nature of aqueous solution of borax is alkaline.

Orthoboric acid is a weak tribasic acid.

Metaboric acid on heating gives an acidic oxide.

$\mathrm{LiBH}_4$ acts as a reducing agent.

I, II and III

I and III only

II and III only

I and II only

Both $X$ and $Y$ are acidic in nature

$X$ is acidic and $Y$ is neutral in nature

Both $X$ and $Y$ are neutral in nature

$X$ is amphoteric and $Y$ is neutral in nature

Reaction of $\mathrm{BF}_3$ with $\mathrm{LiAlH}_4$ in diethyl ether

Oxidation of $\mathrm{NaBH}_4$ with $\mathrm{I}_2$

Reaction of $\mathrm{BF}_3$ with NaH at 450 K

By heating $\mathrm{H}_3 \mathrm{BO}_3$ to above 370 K temperature