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The electrons in a poly-electronic atom are filled one by one in order of increasing energy level.The energy of sub shells and orientation of orbitals depends upon the values of three quantum numbers(i.e n,l and m respectively ) derived from Schrodinger wave equation. The different orbitals of subshells however possess same energy level and are called degenerate orbitals but their energy level changes in presence of magnetic field and the orbitals are non-degenerate. A spectral line is noticed if an electron jumps from one level to other. The paramagnetic nature of element is due to the presence of unpaired electron. Which in each pair is most stable ion: $Cu^+ or Cu^{2+} and Fe^{2+} or Fe^{3+}$

$(a)\;Cu^+,Fe^{3+}\qquad(b)\;Cu^{2+},Fe^{3+}\qquad(c)\;Cu^{2+},Fe^{2+}\qquad(d)\;Cu^+,Fe^{2+}$

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A)
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$Cu^+ (3d^{10})$ shows disproportionation and thus less stable is the $Cu^{2+}$
Hence the answer is (b)
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