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Q.

The wave number of first line of Balmer series of  H-atom is 15200cm-1. The wave number of first Balmer line of Li+2 ion is:

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a

1,36,800 cm-1

b

60,800 cm-1

c

45,600 cm-1

d

30,400 cm-1

answer is A.

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Detailed Solution

H : ν-=R×12122−132 Li+2: ν- =R×32122−132 ν-H : ν-Li+2 = 1:9 ν¯H=15200 cm−1 ν¯Li2+=15200×9=136800 cm−1
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