Which one of the following does not correctly represent the correct order of the property indicated aginst it?

Ti < V<Cr< Mn: increasing number of oxidation states

Ti< V<Cr³⁺<Mn³⁺ : increasing magnetic moment

Ti < V < Cr < Mn : Increasing melting points

Ti < V < Mn < Cr : increasing second ionisation enthalpy

Solution

Ti < V < Cr < Mn : Increasing melting points

Element	Oxidation states
Ti	+2,+3,+4
V	+2,+3,+4,+5
Cr	+1,+2,+3,+4,+5,+6
Mn	+1,+2,+3,+4,+5,+6,+7

Therefore, order of oxidation states is

Ti < V < Cr < Mn

b) $Magnetic space moment comma space straight mu space equals space square root of straight n left parenthesis straight n plus 2 right parenthesis end root Where comma space straight n equals space no. space of space unpaired space electrons$

Ion	Outermost electronic arrangement	No. of unpaired electrons
Ti³⁺	3d¹	1
V³⁺	3d²	2
Cr³⁺	3d³	3
Mn³⁺	3d⁴	4

Therefore, order of magnetic moment is

Ti³⁺ < V³⁺ < Cr³⁺ < Mn³⁺

In 3d- series melting point increases as we move from left to right. But Mn shows low melting point due to its complex formatting nature. It is unable to form metallic and covalent bonds.

Element	Second ionisation enthalpy
Ti	1320
V	1376
Mn	1513
Cr	1635

Therefore, order of second ionisation enthalpy is

Ti< V< Mn< Cr

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

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The D-And-f-Block Elements

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

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

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?