1.

Transition elements show magnetic moment due to spin and orbital motion of electrons. Which of the following metallic ions have almost same spin only magnetic moment ?

Answer»

`Co^(2+)`
`Cr^(2+)`
`Mn^(2+)`
`Cr^(3+)`

SOLUTION :`Co^(2+) = 3d^(7) , Cr^(2+), Cr^(3+)= 3d^(3) , Mn^(2+)= 3d^(5)`.Thus, `Co^(2+)` and `Cr^(3+)` have the same number of UNPAIRED ELECTRONS viz. 3


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