Q10 / 90 · JEE Main 2023 (06 Apr Shift 1) · Chemistry

Strong reducing and oxidizing agents among the following , respectively, are

A
${Ce}^{3 +}$ and ${Ce}^{4 +}$
B
${Ce}^{4 +}$ and ${Tb}^{4 +}$
C
${Ce}^{4 +}$ and ${Eu}^{2 +}$
Correct answer
D
${Eu}^{2 +}$ and ${Ce}^{4 +}$

Solution

$E_{{Ce}^{4 +} / {Ce}^{3 +}} = + 1.74 V$
Lanthanoids have $+ 3$ oxidation state as stable oxidation state. Hence, in their $+ 4$ oxidation state, they act as an oxidising agents and $+ 2$ oxidation state, they act as reducing agents.

Hence, the correct answer is option: 'D'.

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