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Q.

The complexion which has no d-electron in the central metal atom is

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a

MnO4⊖

b

CoNH363+

c

Fe(CN)63−

d

CrH2O63+

answer is A.

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Detailed Solution

Mn(Z=25)⇒3d54s2 In MnO4⊕,Mn7+⇒3d04s0 Hence MnO4Θ does not have any electron in central metal  atom/ion. But4Co3+,Fe3+ and Cr3+ have (6,5 and 3) d-electrons respectively.
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