Which of the following represents the incorrect order of the properties indicated?
A
Ni2+>Cr2+>Fe2+>Mn2+ (size)
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B
Sc>Ti>Cr>Mn (size)
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C
Ni2+<Co2+<Fe2+<Mn2+ (unpaired electron)
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D
H3AsO4>H3PO4 (acidic strength order)
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Solution
The correct options are ANi2+>Cr2+>Fe2+>Mn2+ (size) DH3AsO4>H3PO4 (acidic strength order) Cr2+>Mn2+>Fe2+>Ni2+> is the correct size order. Also, the acidic strength of H3AsO4<H3PO4 as P is more electronegative than As.