Single Choice

Which of the following is diamagnetic?

A$$\left [ Mn\left ( H_{2}O \right )_{6} \right ]^{2+}$$
B$$\left [ Cu\left ( H_{2}O \right )_{6} \right ]^{3+}$$
C$$\left [ Co\left ( NH_{3} \right )_{6} \right ]^{3+}$$
Correct Answer
D$$\left [ Co\left ( H_{2}O \right )_{6} \right ]^{2+}$$

Solution

Diamagnetic compound do not contain unpaired electron. $$[Co(NH_{3})_{6}]^{3+}$$ is octahedral complex with strong field ligand and diamagnetic because, $$Co^{+3}$$ (i.e.$$x-0=+3$$) contain $$3d^{6}$$ electron in the outer most orbit which give electronic configuration of $$d_{xy}^{2}$$ , $$d_{yz}^{2}$$ , $$d_{xz}^{2}$$. All the six electron are paired hence it is diamagnetic.

SIMILAR QUESTIONS

Coordination Compounds

Explain the following: $$Co^{2+}$$ is easily oxidised to $$Co^{3+}$$ in the presence of a strong ligand.

Coordination Compounds

A $$[Cr(H_2O)_6]^{3-}$$ complex typically absorbs at around $$574 \ nm$$. It is allowed to react with ammonia to form a new complex $$[Cr(NH_3)_6]^{3+}$$ that should have absorption at :

Coordination Compounds

What is the correct electronic configuration of the central atom is $$K_4(Fe(CN)_6]$$ on crystal field theory?

Coordination Compounds

$$[Fe(H_2O)_5NO]^{2+}$$ is a complex formed during the brown ring test for $$NO^-_3$$ ion. In this complex :

Coordination Compounds

The stability constants of the complexes formed by a metal ion $$(M^{2+})$$ with $$NH_3,CN^-,H_2O$$ and $$en$$ are of the order $$10^{11},10^{27},10^{15}$$ and $$10^8$$ respectively. Then:

Coordination Compounds

$$\Delta_o$$ increases in the order of $$[CrCl_6]^{3-} < [Cr(CN)_6]^{3-} < [Cr(C_2O_4)_3]^{3-}$$.

Coordination Compounds

The value of the 'spin only' magnetic moment for one of the following configurations is $$2.84$$ BM. The correct one is?

Coordination Compounds

Among the ligands $$NH_3, en, CN^-$$ and $$CO$$, the correct order of their increasing field strength is?

Coordination Compounds

Given complexes are low spin complexes, [V(CN)6]4− [Cr(NH3)6]2+ [Ru(NH3)6]3+ [Fe(CN)6]4− then order of magnetic moment (μ) for V2+,Fe2+,Cr+3,Ru3+ is:

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