1.

Which ofthe following pair of ions have the same colour ?

Answer»

`""_(58)CE^(3+), ""_(63)Eu^(3+)`
`""_(59)Pr^(3+), ""_(64)GD^(3+)`
`""_(62)Sm^(3+), ""_(66)Dy^(3+)`
`""_(71)Lu^(3+), ""_(69)Tm^(3+)`

Solution :Only `Sm^(3+) and Dy^(3+)` have 5 and 9 (14-5) electrons. The IONS having `4f^(n) and 4f^(14-n)`electrons have same colour.


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