The d- and f- B...

$$K_2Cr_2O_7$$ on heating with aqueous $$NaOH$$, gives:

Following elements do not show the properties characteristic of d-block elements :

Which shows maximum magnetic moment among the bivalent ions of the first transition series ?

The correct order of ionic radii of $$Y^{3+}, La^{3+}, Eu^{3+}$$ and $$Lu^{3+}$$ is:
(Atomic number of Y=39, La=57, Eu=63, Lu=71)

To protect iron against corrosion, the most durable metal plating on it, is :

$$CrO_3 +H_2O \rightarrow A \overset{OH^-}{\rightarrow}B$$

The atomic radii of cerium and promethium are quite similar because

The transition metal used as a catalyst is :

$$Fe$$ is made passive by: