What is the type of magnetic behavior and geometry respectively in Cuproammonium sulphate (Atomic no. of $\mathrm{Cu}=29$ )?

• A

  Paramagnetic and tetrahedral
• B

  Diamagnetic and pyramidal
• C

  Diamagnetic and tetrahedral
• Correct answer
  D

  Paramagnetic and square planar

Solution

Cuproammonium sulphate $-\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right] \mathrm{SO}_{4} . \mathrm{H}_{2} \mathrm{O}$ $\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+} \rightarrow$ Oxidation state of $\mathrm{Cu}=+2$

$\mathrm{dsp}^{2}$ - Square planar, Paramagnetic - One unpaired electron.

Hence, the correct answer is option: 'D'.