The reason for the polymeric nature of boric acid is .....

Which metal is protected by a layer of its own oxide?

What does orthoboric acid contain?

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.

Which of the following show diagonal relationship?

Which of the following substances imparts a green color to the burner flame?