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The d-And-f-Block Elements
Question
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Which one of the following ions is the most stable in aqueous solution?

  • Cr3+

  • V3+

  • Ti3+

  • Mn3+

Answer

C.

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 4so -2 unpaired electrons
Ti3+ (19) = 3d1 4s0 -1 unpaired electron
Mn3+ (22) = 3d4 4so - 4 unpaired electrons
So,  Mn3+ ion is most stable in aqueous solution.

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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?