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Q.

The radius of which of the following orbit is same as that of the first Bohr's orbit of hydrogen atom?

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a

He+ (n = 2)

b

Li2+ (n = 2)

c

Li2+ (n = 3)

d

Be3+ (n = 2)

answer is D.

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Detailed Solution

rn=-n2Zr0for first orbit of H-atom, n = 1 and Z = 1r1=121r0    = rofor Be+3, Z = 4, given n = 2r2=n2Zr0=224r0=ro
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