Question

The \[d\pi - p\pi \] bond present in:
A.\[C{O_3}^{2 - }\]
B.\[P{O_4}^{3 - }\]
C.\[N{O_3}^ - \]
D.\[N{O_2}^ - \]

Answer 1

Hint: The chemical elements have a particular atomic number. The electrons were arranged in the orbitals or shells. The shells are K, L, M and N etc.The first shell consists of only one orbital and the second shell consists of two orbitals and the third shell consists of three shells.

Complete answer:
Carbon is the element with atomic number \[6\] and the electrons are arranged in s and p orbitals.
Phosphorous is the element with atomic number \[15\] and the electrons are arranged in s and p orbitals. The shell M consists of s, p and d orbitals.
Nitrogen is the element with atomic number \[7\] and the electrons are arranged in s and p orbitals.
Oxygen is the element with atomic number \[8\] and the electrons are arranged in s and p orbitals.
In the given compounds, \[C{O_3}^{2 - }\] is the compound consisting of carbon and oxygen. There is no d-orbital.
\[P{O_4}^{3 - }\] is a compound consisting of phosphate and oxygen. There is a presence of d-orbital. Thus, \[d\pi - p\pi \] bonding is present.
\[N{O_3}^ - \] is a compound consisting of nitrogen and oxygen. There is no d-orbital.
\[N{O_2}^ - \] is a compound consisting of nitrogen and oxygen. There is no d-orbital.
The \[d\pi - p\pi \] bond present in \[P{O_4}^{3 - }\].
The correct answer is Option B.

Note:
Phosphoric acid is a compound with acidic nature and the phosphate ion can be generated from this acid. It is an oxyanion of phosphorus. It can also be called phosphate or ortho phosphate. It is a trivalent anion.