Question

$\left[Co\right(N{H}_3{)}_6{]}^{2+}$ is paramagnetic.
If true enter 1, else enter 0.

Answer 1

$\left[Co\right(N{H}_3{)}_6{]}^{2+}$ is paramagnetic due to presence of one electron unpaired in presence of strong field ligand (low-spin complex). Here, $Co$ is in +2 oxidation state, which means it is a $d^7$ electron system. In the presence of strong ligand, all electrons get paired leaving 1 unpaired electron.

Hence, the correct answer is 1.