The trivalent ion having largest size in following is
$Ti$
$Zr$
$Hf$
$La$
$CuSO_4(aq) + 4NH_3 \rightarrow X,$ then $X$ is
The transition metal having highest $3^{\text {rd }}$ ionisation enthalpy is :
Which of the following is correct
$\operatorname{Zr}\,(\mathrm{Z}=40)$ and $\mathrm{Hf}\,(\mathrm{Z}=72)$ have similar atomic and ionic radii because of :
What are interstitial compounds? Why are such compounds well known for transition