ચુંબકીય ચાકમાત્રા \(\left( \mu \right)\,\, = \,\,\sqrt {3\,\, \times \,\,\left( {3\,\, + \;\,2} \right)} \,\, = \,\,\sqrt {15} \,\, = \,\,3.87\,BM\)
$(A)$ $\left. Na _{4}\left[ Fe ( CN )_{5} NOS \right)\right]$
$(B)$ $Na _{4}\left[ FeO _{4}\right]$
$(C)$ $\left[ Fe _{2}( CO )_{9}\right]$