Which one of the following ions is the most stable in aqueous solution?

Cr³⁺

V³⁺

Ti³⁺

Mn³⁺

Solution

Ti³⁺

Stability to transition metal ion is directly proportional to the unpaired electron. The exactly half filled and completely filled d - orbitals are extra stable.
Cr³⁺ (21) = 3d³ 4s⁰ -3 unpaired electrons
V³⁺ (20) = 3d² 4s^o -2 unpaired electrons
Ti³⁺ (19) = 3d¹ 4s⁰ -1 unpaired electron
Mn³⁺ (22) = 3d⁴ 4s^o - 4 unpaired electrons
So, Mn³⁺ ion is most stable in aqueous solution.

Some More Questions From The d-And-f-Block Elements Chapter

Explain why Cu⁺ ion is not stable in aqueous solutions?

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The D-And-f-Block Elements

Which one of the following ions is the most stable in aqueous solution?

Cr³⁺

V³⁺

Ti³⁺

Mn³⁺

Some More Questions From The d-And-f-Block Elements Chapter

Explain why Cu⁺ ion is not stable in aqueous solutions?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d¹⁰ 4s¹, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

Why Zn, Cd and Hg are not regarded as transition elements?

Name the first element of 3rd transition series.

Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?

Why are transition elements so named?

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The D-And-f-Block Elements

Which one of the following ions is the most stable in aqueous solution? Cr3+ V3+ Ti3+ Mn3+

Some More Questions From The d-And-f-Block Elements Chapter

Explain why Cu+ ion is not stable in aqueous solutions?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

Why Zn, Cd and Hg are not regarded as transition elements?

Name the first element of 3rd transition series.

Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?

Why are transition elements so named?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Which one of the following ions is the most stable in aqueous solution?

Cr³⁺

V³⁺

Ti³⁺

Mn³⁺

Explain why Cu⁺ ion is not stable in aqueous solutions?

The outer electronic configuration of copper is 3d¹⁰ 4s¹, yet it is considered transition element. Why?