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Question

Chemistry Question on coordination compounds

The longest wavelength in Ao in the Balmer series of singly ionised helium ion, He+ is

A

(A) 6565 Ao

B

(B) 912 Ao

C

(C) 60932.2 Ao

D

(D) 1641 Ao

Answer

(D) 1641 Ao

Explanation

Solution

Explanation:
1λ=RH[1n12−1n22]z2 [For Balmer series n1=2, For minimum energy n2=3}=10678[122−132]22=10678[14−19]×4=10678[9−436]=10678×59λ=1641.1×10−8cm=1641.1A∘Hence, it is the correct answer.