Boric acid is an acid because its molecule
- contains replaceable $H^{+}$ ion
- gives up a proton
- accepts $OH^{-}$ from water releasing proton
- combines with proton from water molecule
The Correct Option is C
Solution and Explanation
Lewis Acid and Boric Acid
Lewis acids are substances whose octet is incomplete and accept electrons. Boric acid is a monobasic weak acid. It does not liberate \(H ^{+}\) ion but instead accepts electrons from the \(OH ^{-}\) ion, i.e., it behaves as a Lewis acid.
Boric Acid Reaction
The reaction of boric acid can be represented as:
\(H_3PO_3 + H_2O \rightarrow B(OH)_4^{-} + H^{+}\)
Alternatively, the following reaction can also be observed:
\(B(OH)_3 + 2H_2O \rightarrow [B(OH)_4]^{-} + H_3O^{+}\)
Structure of Boric Acid
The structure of \(H_3BO_3\) is as shown below, where the octet of boron in \(H_3BO_3\) is incomplete. This incomplete octet allows boric acid to act as a Lewis acid, accepting electron pairs from other molecules.
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Concepts Used:
P-Block Elements
- P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
- P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.
P block elements consist of:
- Group 13 Elements: Boron family
- Group 14 Elements: Carbon family
- Group 15 Elements: Nitrogen family
- Group 16 Elements: Oxygen family
- Group 17 Elements: Fluorine family
- Group 18 Elements: Neon family