What is the EAN of Zn in $\left[\mathrm{Zn}\left(\mathrm{NH}_3\right)_4\right]^{2+}$ ?

What is the EAN of Zn in $\left[\mathrm{Zn}\left(\mathrm{NH}_3\right)_4\right]^{2+}$ ?
  1. 32
  2. 28
  3. 30
  4. 36

Solution

$\mathrm{Z}=30, \mathrm{X}=2, \mathrm{Y}=8$
EAN of $\mathrm{Zn}^{2+}=\mathrm{Z}-\mathrm{X}+\mathrm{Y}=30-2+8=36$ $(\mathrm{Z}=$ atomic number of metal, $\mathrm{X}=$ charge on metal, $Y=$ electrons donated by ligand.)

Asked in: MHT CET 2024 (16 May Shift 1)

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