Choose an Incorrect match of colour of compounds
$MnO(OH)_2 \to $ White precipitate
$K_3[Co(NO_2)_6] \to $ Yellow precipitate
$(NH_4)_3[As(Mo_3O_{10})_4] \to $ Yellow precipitate
$(NH_4)_3[P(Mo_3O_{10})_4] \to $ Yellow precipitate
Write a note on oxides and oxoanions of transition elements.
Which one amongst the following are good oxidizing agents?
$A.$ $Sm ^{2+}$ $B.$ $Ce ^{2+}$ $C.$ $Ce ^{4+}$ $D.$ $Tb ^{4+}$
Choose the most appropriate answer from the options given below :
Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following points:
$(i)$ electronic configurations,
$(ii)$ oxidation states,
$(iii)$ ionisation enthalpies, and
$(iv)$ atomic sizes.
$Zn$ and $Cd$ metals do not show variable valency because
Elements which generally exhibit multiple oxidation states and whose ions are usually coloured are