Single Choice

The INCORRECT statement is:

AThe spin - only magnetic moments of $$[Fe(H_{2}O)_{6}]^{2+}$$ and $$[Cr(H_{2}O)_{6}]^{2+}$$ are nearly similar
BThe spin-only magnetic moment of $$[Ni(NH_{3})_{4}(H_{2}O)_{2}]^{2+}$$ is $$2.83\ BM$$
CThe gemstone, ruby, has $$Cr^{3+}$$ ions occupying the octahedral sites of beryl
Correct Answer
DThe color of $$[CoCl (NH_{3})_{5}]^{2+}$$ is violet as it absorbs the yellow light

Solution

(1) $$[Fe(H_{2}O)_{6}]^{2+}, Fe^{2+} \rightarrow 3d^{6} \rightarrow 4$$ unpaired electron

$$[Cr(H_{2}O)_{6}]^{2+}, Cr^{2+}\rightarrow 3d^{4}\rightarrow 4$$ unpaired electron

(2) $$[Ni(NH_{3})_{4}(H_{2}O)_{2}]^{2+} ,\ Ni^{2+}\rightarrow 3d^{8}\rightarrow 2$$ unpaired electron

$$\mu_{m} = 2.83\ B.M$$

(3) In gemstone, ruby has $$Cr^{3+}$$ ion occupying the octahedral sites of aluminium oxide $$(Al_{2}O_{3})$$ normally occupied by $$Al^{3+}$$ ion.

(4) The complementary color of violet is yellow.

SIMILAR QUESTIONS

d - block and f - block Elements

Select the correct order with respect to paramagnetic property of the ions.

d - block and f - block Elements

The magnetic moment of $$[Cu(NH_{3})_{4}]^{2+}$$ was found to be 1.73 B.M. The number of unpaired electrons in the complex is:

d - block and f - block Elements

Which of the following ions having the following electronic structure would have a maximum magnetic moment?

d - block and f - block Elements

Titanium shows the magnetic moment of 1.73 B.M. in its compound. What is the oxidation number of $$Ti$$ in the compound?

d - block and f - block Elements

The correct order of the spin-only magnetic moment of metal ions in the following low spin complexes, $$[V(CN)_6]^{4-}, [Fe(CN)_6]^{4-}$$, $$[Ru(NH_3)_6]^{3+}, $$ and $$[Cr(NH)_3)_6]^{2+}$$, is:

d - block and f - block Elements

The calculated spin-only magnetic moments (BM) of the anionic and cationic species of $$[Fe(H_2O)_6]_2$$ and $$[Fe(CN)_6]$$, respectively, are:

d - block and f - block Elements

Consider the hydrates ions of $$Ti^{2+}, V^{2+}, Ti^{3+}$$ and $$Sc^{3+}$$. The correct order of their spin-only magnetic moments is:

d - block and f - block Elements

The correct order of spin-only magnetic moments among the following is: (Atomic number: $$Mn=25, Co=27, Ni=28, Zn=30)$$.

d - block and f - block Elements

Which of the following transition metal ions will have definite value of magnetic moment?

d - block and f - block Elements

Which of the following has the highest paramagnetism?

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