SATHEE: The dand fblock elements

The dand fblock elements - Result Question 3

####3. Which one of the following ions exhibits $d - d$ transition and paramagnetism as well? [2018]

(a) $C r O_{4}^{2 -}$

(b) $C r_{2} O_{7}^{2 -}$

(d) $M n O_{4}^{-}$

Show Answer

Solution:

$C r_{2} O_{7}^{2 -} C r^{6 +}$ diamagnetic

$M n O_{4}^{-} M n^{7 +}$ diamagnetic

$M n O_{4}^{2 -} M n^{6 +}$ paramagnetic

Thus, unpaired electron is present, so $d - d$ transition is possible.

For tetrahedral geometry:

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The dand fblock elements - Result Question 3

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