Strong reducing and oxidizing agents among the following , respectively, areCe3+ and Ce4+Ce4+ and Tb4+Ce4+and Eu2+Eu2+ and Ce4+

The strongest reducing agent among the given options is Eu2+ and the strongest oxidizing agent is Ce4+.

Here's why:

1. Reducing agents: These are substances that lose (or donate) electrons. The strength of reducing agents increases down the group and from right to left across a period in the periodic table. Therefore, among the given options (Ce3+, Ce4+, Tb4+, Eu2+), Eu2+ is the strongest reducing agent because Europium (Eu) is located lower in the periodic table.

2. Oxidizing agents: These are substances that gain (or accept) electrons. The strength of oxidizing agents decreases down the group and from right to left across a period in the periodic table. Therefore, among the given options (Ce3+, Ce4+, Tb4+, Eu2+), Ce4+ is the strongest oxidizing agent because Cerium (Ce) is located higher in the periodic table and has a higher oxidation state (+4).