In a borax bead test under hot condition, a metal salt (one from the given) is heated at point B of the flame, resulted in green colour salt bead. The spin-only magnetic moment value of the salt is ............ BM (Nearest integer)
[Given atomic number of Cu=29,Ni=28, Mn=25,Fe=26]
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Solution
$\mathrm{Fe}^{+3}$ will give green coloured bead when heated at point B .
Number of unpaired $\mathrm{e}^{-}$in $\mathrm{Fe}^{+3}=5$
$$
\mu=5.92
$$
Nearest integer $=6$
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