Write balanced equations for:

Explain structures of diborane. Write the structures of diborane and explain the nature of bonding in it ?

How is borax prepared? Enlist the important uses of borax.

Write a short note on borax bead test.

A certain salt X, gives the following results:
It aqueous solution is alkaline to litmus.

A certain salt X, gives the following results:
It swells up to a glassy material Y on strong heating. 

A certain salt X, gives the following results:
When conc. H₂SO₄ is added to a hot solution of X, white crystals of an acid Z separate out.

What are boric acids?

How is orthoboric acid prepared?