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Q.

The Bohr orbit radius for the hydrogen atom (n = 1) is approximately 0.530 Ao.The radius for the first excited state (n = 2) orbit is (in Ao)

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a

4.77

b

1.06

c

0.13

d

2.12

answer is D.

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Detailed Solution

rn=ro×n2Z n = Number of orbit, Z = charge on nucleus 1st excited state for H=n=2Z=1 =0.53×221 =0.53×4=2.12 Ao
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