Chemistry - f-block Question with Solution | TestHub

Here$\mathrm{Z}{\mathrm{r}}^{+4}$(4d) and$\mathrm{H}{\mathrm{f}}^{+4}$(5d) are having same size which is possible due to poor screening effect by inner d or f orbitals electrons due to highly diffused shape of these orbitals or Lanthanide contraction in${\mathrm{H}}_{\mathrm{f}}.$