The spin-only magnetic moment value of an octahedral complex among \(CoCl_3⋅4NH_3\), \(NiCl_2⋅6H_2O\) and \(PtCl_4⋅2HCl\), which upon reaction with excess of \(AgNO_3\) gives 2 moles of \(AgCl\) is _____ B.M. (Nearest Integer)
Correct Answer: 3
Solution and Explanation
\(CoCl_3⋅4NH_3 \xrightarrow{\text {excess} \ AgNO_3 } [Co(NH_3)_4⋅Cl_2]+AgCl\)
\(NiCl_2⋅6H_2O\xrightarrow{\text {excess} \ AgNO_3 }[Ni(H_2O)_6]_2+ +2AgCl\)
\(PtCl_4⋅2HCl→[PtCl_6]^{4−} + \text {No AgCl ppt}\)
\([Ni^{2+}(H_2O)_6]=d^8=t_2g^6 e^2_g=2\) unpaired~electrons
Magnetic moment,
\(=\sqrt {2(2+2)}\)
\(=\sqrt 8\)
\(≈3\)
So, the answer is \(3\).
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Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.