The type of hybridisation of boron in diborane is

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

Aluminium $(III)$ chloride forms a dimer because ........

Moissan boron is

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$ : Boric acid is a weak acid.
Reason $R$ : Boric acid is not able to release $H^{+}$ ion on its own. It receives $OH^{-}$ ion from water and releases $H^{+}$ ion.
In the light of the above statements,choose the most appropriate answer from the options given below.

Is boric acid a protic acid? Explain.