Question:
Which one of the following compounds is not a protonic acid:
Which one of the following compounds is not a protonic acid:
Updated On: Apr 28, 2026
- \(B(OH)_3\)
- \(PO(OH)_3\)
- \(SO(OH)_2\)
- \(SO_2(OH)_2\)
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The Correct Option is A
Solution and Explanation
Protonic acids are substances that can donate a proton (H+ ion) in aqueous solution. Let's analyze the given compounds:
(A) B(OH)3: Boron does not readily donate protons in aqueous solution, so this is not a protonic acid.
(B) PO(OH)3: Phosphorous acid (H3PO3) is a protonic acid, as it can donate protons in aqueous solution.
(C) SO(OH)2: Sulfurous acid (H2SO3) is a protonic acid, as it can donate protons in aqueous solution.
(D) SO2(OH)2: This compound, sulfuric acid (H2SO4), is a well-known strong protonic acid.
So, among the given options, (A): B(OH)3 is not a protonic acid.
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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