MCQ
Strong reducing and oxidizing agents among the following, respectively, are :
- A$Ce ^{4+}$ and $Eu ^{2+}$
- ✓$Eu ^{2+}$ and $Ce ^{4+}$
- C$Ce ^{3+}$ and $Ce ^{4+}$
- D$Ce ^{4+}$ and $Tb ^{4+}$
✓
Answer
Correct option: B.
$Eu ^{2+}$ and $Ce ^{4+}$
(B)$Eu ^{2+}$ and $Ce ^{4+}$
The stable oxidation state of lanthanoids is $+3 . Ce ^{4+}$ tends to accept an electron to change to +3 state. Hence, it acts as a good oxidising agent. $E u^{2+}$ has a strong tendency to lose an electron to attain the more stable +3 oxidation state of lanthanoids. Hence, it is a strong reducing agent.
The stable oxidation state of lanthanoids is $+3 . Ce ^{4+}$ tends to accept an electron to change to +3 state. Hence, it acts as a good oxidising agent. $E u^{2+}$ has a strong tendency to lose an electron to attain the more stable +3 oxidation state of lanthanoids. Hence, it is a strong reducing agent.
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