1.

Lanthanidwes shows variable oxidation state, because they release electron from the following orbitalsA. 4fB. 6sC. 5dD. all of these

Answer» Correct Answer - D
We know that, lanthanide shows `+2,+3,+4.` O.S. by loss of two, three and four electrons. These electrons may be rmoved from 6s, 4f and 5d orbitals.


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