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Select the incorrect statement(s) IE(...

Select the incorrect statement(s)
IE(I) of nitrogen atom is less than IE(I) of oxygen atom.
Electron affinity of oxygen is less than selenium atom
Electronegativity on Pauling scale is "2.8" times greater than electronegativity on Muliken scale.
The \(Cr^{6+}\) is smaller than \(Cr^{3+}\)

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