Atomic number of Cr and Fe are respectively 24 and 26, which of the following is paramagnetic with the spin of electron?
A
[Cr(CO)6]
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B
[Fe(CO)5]
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C
[Fe(CN)6]4−
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D
[Cr(NH3)6]3+
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Solution
The correct option is A[Cr(CO)6] Atoms, ions or molecules having unpaired electrons are paramagnetic. (a) In [Cr(CO)6](O.N.ofCr=0) 24CrGroundstate=1s2,2s22p6,3s23p63d5,4s1