Which one of Fe2+and Fe3+is more paramagnetic and why ?
Valence shell configuration of Fe3+ and Fe2+ is 3d5 and 3d6 respectively. In Fe3+ all the electrons re unpaired while in Fe2+ 4 electrons are unpaired. A paramagnetic behaviour is arise from the number of unpaired electrons. So, Fe3+ is more paramagnetic than Fe2+.