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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cc040

Using EAN $= Z - oxidation state + 2 \times$ number of ligands (all monodentate; $Z$ : Mn 25, Fe 26, Cu 29, Zn 30), which of the following complex ions have EAN equal to 36?

A $[Fe (CN) X_{6}] X^{4 -}$
B $[Cu (NH X_{3}) X_{4}] X^{2 +}$
C $[Zn (NH X_{3}) X_{4}] X^{2 +}$
D $[Mn (CN) X_{6}] X^{3 -}$

Answer: A, C

Fe(II):

26 - 2 + 12 = 36

. Cu(II):

29 - 2 + 8 = 35

. Zn(II):

30 - 2 + 8 = 36

. Mn(III):

25 - 3 + 12 = 34

. So only the Fe and Zn complexes reach 36.

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