Fundamentholfundamenthol
JEE Main2019Chemistry
Q.

The lanthanide ion that would show colour is

  1. A

    Gd3+ 

  2. B

    Lu3+    

  3. C

    La3+ 

  4. D

    Sm3+

Solution

Sm+3 = Partially filled f orbital = 4f5

Sm = 4f66s2

Sm+3 = Yellow.

Lu+3 = 4f14 colourless.

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