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Q.

The ground and first excited state energies are E1 and E2 respectively. Which pair of species has same energy ? [Note that energy is indicated in the bracket].

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a

H(E1), Li2+(E2)

b

He+(E1), Be3+(E2)

c

He+(E1), Li2+(E2)

d

H(E2), Be3+(E1)

answer is B.

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Detailed Solution

E=-13.6n2Z2 Eα-n2Z2

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