First slide

Chemical properties

Question

Statement-I: In aqueous solution, compounds of Eu⁺² are good reducing agents.
Statement-II: Initial members of Lanthanoids resemble aluminium in their chemical reactivity

Moderate

A

Both statements I and II are correct
B

Statement-I is correct and statement-II is incorrect
C

Statement-I is incorrect and statement-II is correct
D

Both statements I and II are incorrect

Solution

I) $E_{{Ce}^{+ 4} / {Ce}^{+ 3}}^{o} is + 1.74 V . {Ce}^{+ 4}$ is a very strong oxidant in aqueous solution. But the rate of reactivity is very slow.
II) $E_{{Eu}^{+ 3} / {Eu}^{+ 2}}^{0}$ is negative. Thus Eu⁺² is a strong reductant in aqueous solution.
III) Initial members of Lanthanoids resemble Calcium in their reactivity and later members resemble Aluminium in their reactivity.

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