Question

Given below are two statements:
Statement I : The $E ^{\circ}$ value of $Ce ^{4+} / Ce ^{3+}$ is $+1.74 V$
Statement II : Ce is more stable in $Ce ^{4+}$ state than $Ce ^{3+}$ state.
In the light of the above statements, choose the most appropriate answer from the options given below:

• A. Both statement I and statement II are correct
• B. Statement I is incorrect but statement II is correct
• C. Both statement I and statement II are incorrect
• D. Statement I is correct but statement II is incorrect

Answer 1

Answer: (D)

The $E ^{\circ}$ value for $Ce ^{4+} / Ce ^{3+}$ is $+1.74 V$ because the most stable oxidation state of lanthanide series elements is $+3$.
It means $Ce ^{3+}$ is more stable than $Ce ^{4+}$.