Which of the following is paramagnetic?
Which of the following is paramagnetic?
[CoBɣ]2-
Mo(Co)6
[Pt(en)Cl2]
[Co(NH3)6]3+
The Correct Option is A
Solution and Explanation
To determine which of the given complexes is paramagnetic, we need to examine the electronic configuration of the metal centers and the nature of the ligands. Paramagnetism arises from unpaired electrons in an atom, ion, or molecule.
Let's analyze each option:
[CoBɣ]2-: Assuming the ligand "Bγ" doesn't affect the oxidation state, cobalt is typically Co(II) here, which has an electronic configuration of 3d7. This means it has unpaired electrons, indicating paramagnetism.
Mo(CO)6: The Mo atom in Mo(CO)6 is in the zero oxidation state (Mo0), and carbonyl (CO) is a strong field ligand leading to pairing of electrons. Thus, it is diamagnetic.
[Pt(en)Cl2]: Platinum(II) typically has a low-spin d8 configuration with all electrons paired. Therefore, it is diamagnetic.
[Co(NH3)6]3+: The cobalt ion here is Co(III) with a d6 configuration in a low-spin state, which results in paired electrons, making it diamagnetic.
In conclusion, [CoBɣ]2- is paramagnetic due to the presence of unpaired electrons in the cobalt ion.
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SRMJEEE Notification
GMC Azamgarh Admission 2025: Dates, Courses, Fees, Eligibility, SelectJuly 22, 2025Concepts Used:
Chemical Bonding and Molecular Structure
Such a group of atoms is called a molecule. Obviously, there must be some force that holds these constituent atoms together in the molecules. The attractive force which holds various constituents (atoms, ions, etc.) together in different chemical species is called a chemical bond.
Types of Chemical Bonds:
There are 4 types of chemical bonds which are formed by atoms or molecules to yield compounds.
- Ionic Bonds - Ionic bonding is a type of chemical bonding which involves a transfer of electrons from one atom or molecule to another.
- Covalent Bonds - Compounds that contain carbon commonly exhibit this type of chemical bonding.
- Hydrogen Bonds - It is a type of polar covalent bonding between oxygen and hydrogen wherein the hydrogen develops a partial positive charge
- Polar Bonds - In Polar Covalent chemical bonding, electrons are shared unequally since the more electronegative atom pulls the electron pair closer to itself and away from the less electronegative atom.
Factors Affecting Bond Enthalpy in Chemical Bonding:
- Size of the Atom
- Multiplicity of Bonds
- Number of Lone Pair of Electrons Present
- Bond Angle