`{:("Column-I","Column-II"),("List-I","List-II"),((A)n=6ton=3("In H-atom"),(p)"10 lines in the spectrum"),((B)n=7ton=3("In H-atom"),(q)"Spectral lines in visible region"),((C )n=5ton=2("In H-atom"),(r)"6 lines in the spectrum"),((D)n=5ton=1("In H-atom"),(s)"Spectral lines in infrared region"),(,(t)"Spectral lines in U.V. region"):}`

Answer

A`to` r,s ; B`to`p,s ; C`to`q,r,s ; D`to` p,q,s,t

Explanation

(A)`6to3 " " Deltan=3`
`:.` no of lines `=(3(3+1))/2=6`
All lines are in infrared region
(B)`7to3 " " Deltan=4`
`:.` no of lines `=(4(4+1))/2=10`
All lines are in infrared region
( C)`5to2 " " Deltan=3`
Lines are in visible region and also in infrared region
( D)`5to1 " " "Number of lines"=(5xx4)/2=10`
Lines are in visible region and also in infrared region and also in U.V region