Question

The wave number of the first line of Balmer series of hydrogen is `15200 cm ^(-1)` The wave number of the first Balmer line of `Li^(2+)` ion is
A. `15200 cm^-1`
B. `60800 cm^-1`
C. `76000 cm^-1`
D. `136800 cm^-1`

Answer 1

Correct Answer - D
(d) `overline v(Li^(2+)) = z^2 xx 15200 cm^-1`
=`3^2 xx 15200 cm^-1`
=`9 xx 15200 cm^-1`
=`136800 cm^-1`.