Which of the following acts as a strong reducing agent?

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Solution

Q.
Which of the following acts as a strong reducing agent
(Atomic number : Ce = 58, Eu = 63, Gd = 64, Lu = 71) [2024]

1 ${Lu}^{3 +}$

2 ${Ce}^{4 +}$

3 ${Gd}^{3 +}$

4 ${Eu}^{2 +}$

Ans.
(4)

Common oxidation state of Lanthanoids is +3. ${Ce}^{4 +}$ has tendency to go to ${Ce}^{3 +}$ hence ${Ce}^{4 +}$ is good oxidising agent. ${Eu}^{2 +}$ has tendency to go to ${Eu}^{3 +}$ , hence is good reducing agent.

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