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Q.

The radius of the second Bohr orbit in terms of the Bohr radius, a0, in Li2+ is

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a

2a03

b

4a03

c

4a09

d

2a09

answer is B.

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Detailed Solution

According to Bohr model, radius of orbitrn=a0×n2Z, where a0= Bohr radius (Radius of 1st orbit of H-atom) For, Li2+,Z=3 and n=2∴ r=22×a03=4a03
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