1.

All lanthanides exhibit a stable valency of

Answer»

2
3
4
6

Solution :We know that all LANTHANIDE shows STABLE valency of 3. It is due to stability of 4F orbitals, high I. P., high lattie energy of solid, high hydration energy of `Ln^(3+)` ion in aqueous medium and high NEGATIVE value of reduction potential.


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