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Q.

An ionic atom equivalent to hydrogen atom has wavelength equal to 1/4 of the wavelengths of hydrogen lines. The ion will be

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a

He+

b

Li++

c

Ne9+

d

Na10+

answer is A.

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Detailed Solution

ν¯∝1λ∝Z2⇒λZ2=constant  ⇒λ=λ4Z2⇒Z=2
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An ionic atom equivalent to hydrogen atom has wavelength equal to 1/4 of the wavelengths of hydrogen lines. The ion will be