Solve this:
Q.5. Which one of the following ions will be colourless?
(a) L a 3 +
(b) N d 3 +
(c) P r 3 +
(d) T i 3 +

Dear Student,

The element/ion which have ​​
does not have unpaired d- electrons will be colourless.

a) The electronic configurations of 57La+3 = 1s22s22p63s23p64s23d104p65s24d105p6

b) ​​60Nd+3:1s22s22p63s23p64s23d104p65s24d105p6 4f3

c)  59Pr+3 : ​1s22s22p63s23p64s23d104p65s24d105p6 4f2

d)22Ti+3 :    ​1s22s22p63s23p64s13d0

So all ions are does not have unpaired d-electrons , so all ions are colouless.

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option A

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