Question

If $H{g}^{2+}$ salts are coloured enter 1, else enter 0.

Answer 1

$H{g}^{2+}$ salts are colourless. The electronic configuration of Hg is $\left[Xe\right]4f^{14}5d^{10}6s^2$. It loses 2 electrons to become $H{g}^{2+}$ which has fully filled 5d-orbitals (i.e. there is no unpaired electron is 5d). Hence, no d−dtransition can take place and so, it is colourless. Tranisition of electron from d orbital to s orbital will require high energy and it doesnot fall within the visible region.