Boric acid forms metaboric acid on heating at red hot.

Given below are two statements:
Statement $\mathrm{I}:$ Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame.

Statement $\mathrm{II}:$ Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame.

In the light of the above statements, choose the most appropriate answer from the options given below.

Which of the following solution is used as washing solution for eyes to free them from microorganisms?

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason $\mathrm{R}$.

Assertion $\mathrm{A}$ : Boric acid is a weak acid

Reason $\mathrm{R}$ : Boric acid is not able to release ${\mathrm{H}}^{+}$ ion on its own. It receives ${\mathrm{OH}}^{-}$ ion from water and releases ${\mathrm{H}}^{+}$ ion.

In the light of the above statements, choose the most appropriate answer from the options given below.

The correct statements from below are:

(I) ${\mathrm{H}}_3{\mathrm{BO}}_3$ is a liquid
(II) ${\mathrm{H}}_3{\mathrm{BO}}_3$ forms a layer structure
(III) In ${\mathrm{H}}_3{\mathrm{BO}}_3,$ each ${\mathrm{BO}}_3$ unit is joined by hydrogen bonds
(IV) ${\mathrm{H}}_3{\mathrm{BO}}_3$ is tribasic.

Identify the correct statements from the following:

(a) In Orthoboric acid, boron is in planar geometry. 

(b) In ${\mathrm{BCl}}_3·{\mathrm{NH}}_3$, boron has tetrahedral geometry. 

(c) Aqueous solution of borax is acidic. 

Explain what happens when boric acid is heated.