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Question

Ratio of radii of second and first orbits of H atom is:

A
2:1
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B
4:1
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C
3:1
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D
5:1
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Solution

The correct option is B 4:1
Bohr's radius for nth orbit, (rn)=0.529[n2Z]A
where n=Orbit number, Z=Atomic number

Since, rn2
r2r1=2212=4

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