a Ferric salts are more stable than Ferrous salts. $F e ^{3+}$ ion are more stable compared to $Fe ^{2+}$ due to its electronic configuration. The electronic configuration of $F e ^{3+}$ is $[ Ar ] 3 d ^5 4 s ^0$ i.e half-filled which makes it more stable.
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$Cr ^{3+} / Cr ^{2+}$, $Mn ^{3+} / Mn ^{2}, Fe ^{3+} / Fe ^{2+}$ અને $Co ^{3+} / Co ^{2+}$ કે જે ઋણ પ્રમાણિત ઈલેક્ટ્રોડ પોટેન્શીયલ ધરાવે છે. તેમાંથી $M ^{3+}$ આયનની સ્પીન-ફક્ત ચુંબકીય ચાકમાત્રા મૂલ્ય $....\,B.M.$ છે. [નજીકનો પૂર્ણાંક]