Embibe Experts Solutions for Chapter: The d- and f-Block Elements, Exercise 1: Exercise-1

The atomic radii of palladium and platinum are nearly same. Why ?

The elements in which electrons are progressively filled in $4\mathrm{f}$-orbital are called:

What is the general electronic configuration of transition elements?

 Why do transition elements show variable oxidation states? 

Why does ${\mathrm{AgNO}}_3$ produce a black stain on the skin?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

The chemistry of the actinoid elements is not so smooth as that of the lanthanoids. Justify this statement by giving some examples from the oxidation state of these elements.

Why ${\mathrm{Sm}}^{2+}, {\mathrm{Eu}}^{2+}$and ${\mathrm{Yb}}^{2+}$ ions in solutions are good reducing agents, but an aqueous solution of ${\mathrm{Ce}}^{4+}$ is a good oxidising agent.