Question

which of the following Lanthanides element do not show stable +4 Oxidation State?
Eu
Dy
Tb
Ce​

Answer 1

Answer:

• Europium (Eu) do not show + 4 Oxidation state.

Explanation:

$\rule{300}{1.5}$

Lanthanoid elements like Dysprosium (Dy), Terbium (Tb) and Cerium (Ce) can show stable oxidation state of + 4.

Where as Europium can show oxidation state of + 2 and + 3.

So, Correct answer is Option-a i.e. Europium (Eu).

Extra Information:

• Eu²⁺ is strong reducing agent which changes to common + 3 oxidation state.

• Elements like Promethium, Neodymium, Terbium and Dysprosium exhibit + 4 oxidation state only in MO₂ oxide form.

• Most of the lanthanoids exhibit + 3 oxidation state.

• In lanthanoids hardness increases as atomic number increases.

$\rule{300}{1.5}$

Answer 2

Answer:

Eu

Explanation:

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