Chemistry - f-block Question with Solution | TestHub
List - I (Elements) | List - II (Characteristics) |
|---|---|
(P) Tb | (1) Highest atomic size among elements in C-I |
(Q) Nd | (2) Highest ionic size ( ) among elements in C-I |
(R) Eu | (3) Can show multiple oxidation states |
(S) Ce | (4) Ground state electronic configuration contains in 'd' subshell |
| (5) Can act as oxidizing agent in a particular oxidation state |
Options:
Answer:
Solution:
Terbium can show multiple oxidation states (+3, +4) and has f–d involvement → (3,4,5).
Neodymium shows relatively higher ionic size among given due to lesser effective nuclear charge → (4).
Europium has relatively larger ionic radius and stable +2 state tendency → (1,4).
Cerium has 4f and 5d involvement in ground state and can act as oxidizing agent in +4 state → (2,4,5).
These properties arise from lanthanoid contraction and variable f-electron participation in bonding.