D-And F-Block Elements Ques 423

Question: Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other in

[AIIMS 2005]

Options:

A) $ T{{l}^{+}},\ T{{l}^{3+}} $

B) $ C{{u}^{+}},\ C{{u}^{2+}} $

C) $ C{{r}^{2+}},\ C{{r}^{3+}} $

D) $ {{V}^{2+}},\ V{{O}^{2+}} $

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Answer:

Correct Answer: A

Solution:

$Tl^{+}$ ions are more stable than $Tl^{3+}$ and thus, $Tl^{3+}$ ions change to $Tl^{+}$ ions thereby acting as oxidising agents.

$Tl^{3+}$ compounds + 2e $\rightarrow$ $Tl^{+}$ compounds



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