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Question

# Match the following: List - IList - II(A) n=6→n=3(In H- atoms)(p)10 lines in the spectrum(B) n=7→n=3(In H atoms)(q) Spectral lines in visible region(C) n=5→n=2(In H-atoms)(r) 6 lines in the spectrum(D) n=5→n=1(In H-atoms) (s) Spectral lines in infrared region (t) Spectral lines in U.V. region

A
(Ar,s) (Bp,s); (Cq,r,s); (Dp,q,s,t)
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B
(Ar) (Bp,s); (Cq,r,s); (Dp,q,s,t)
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C
(Ar,s) (Bp,s); (Cq,r); (Dp,q,s,t)
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D
(Ar,s) (Bp,s); (Cq,r,s); (Dp,q,s)
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Solution

## The correct option is A (A→r,s) (B→p,s); (C→q,r,s); (D→p,q,s,t)(A) 6→3 △n=3 ∴no. of lines =3(3+1)2=6 All lines are in infrared region (B) 7→3 △n=4 ∴no. of lines=4(4+1)2=10 All lines are in infrared region (C) 5→2 △n=3 ∴no. of lines =3(3+1)2=6 Lines are in visible region and also in infrared region (D) 5→1 △n=4 ∴no. of lines=5×42=10 Lines are in visible region, in Infrared region and also in U.V. region.

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