Which is not arranged in the correct sequence? Option 1) $MO, M_{2}O_{3}, MO_{2}, M_{2}O_{5}$   decreasing basic strength Option 2) $d^{5},d^{3},d^{1},d^{4}$ increasing magnetic moment Option 3) $Sc, V, Cr, Mn$ - Increasing number of oxidation states Option 4) $CO^{2+}, fe^{3+}, Cr^{3+},Sc^{3+}$ - Increasing stability

P Plabita

As learnt in

Magnetic Quantum Number (m) -

It  gives information about the spatial orientation of the orbital with respect to standard set of co-ordinate axis.

-

The magnetic moment is maximum when the maximum number of orbitals are occupied by single electrons.

Clearly, that is not the case in option 2 as d5 has maximum magnetic moment.

d5

Option 1)

$MO, M_{2}O_{3}, MO_{2}, M_{2}O_{5}$   decreasing basic strength

This option is incorrect

Option 2)

$d^{5},d^{3},d^{1},d^{4}$ increasing magnetic moment

This option is correct

Option 3)

$Sc, V, Cr, Mn$ - Increasing number of oxidation states

This option is incorrect

Option 4)

$CO^{2+}, fe^{3+}, Cr^{3+},Sc^{3+}$ - Increasing stability

This option is incorrect

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