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Q.

In the following atoms and moleculates for the transition from n= 2  to n = 1, the spectral line of minimum wavelength will be produced by

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a

Hydrogen atom

b

Deuterium atom

c

Uni-ionized helium

d

di-ionized lithium

answer is D.

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Detailed Solution

1λ=RZ2112−122For di-ionised lithium the value of Z is maximum.
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