JEE MAIN - Chemistry (2005 - No. 46)
Which one of the following cyano complexes would exhibit the lowest value of
paramagnetic behaviour?
(At. No. Cr = 24, Mn = 25, Fe = 26, Co = 27)
(At. No. Cr = 24, Mn = 25, Fe = 26, Co = 27)
[Cr(CN)6]-3
[Mn(CN)6]-3
[Fe(CN)6]-3
[Co(CN)6]-3
Explanation
| No. of unpaired electron | |||
|---|---|---|---|
| a) | Co3+ | 0 | |
| b) | Fe3+ | 1 | |
| c) | Mn3+ | 2 | |
| d) | Cr3+ | 3 |
The effective magnetic moment is given by the number of unpaired electrons in a substance, the lesser the number of unpaired electrons lower is its magnetic moment in Bohr $$-$$ Magneton and lower shall be its paramagnetism
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