Q.

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

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a

1 : 2 : 3

b

6 : 3 : 2

c

1 : 1 : 1

d

1 : 4 : 9

answer is B.

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Detailed Solution

r∝n2Z; n is given as 1, thus rH : rHe+:rLi2+=11: 12: 13;
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