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Question

The ratio of radii of first orbits of H, He+ and Li2+ is

A
1 : 2 : 3
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B
6 : 3 : 2
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C
1 : 4 : 9
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D
9 : 4 : 1
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Solution

The correct option is B 6 : 3 : 2

r=n22×0.529˚A
rH:rHe+:rLi2+
=1:12:13
=6:3:2


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