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Question

If the value of En=78.4 kcal / mole, the order of the orbit in hydrogen atom is:

A
4
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B
3
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C
2
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D
1
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Solution

The correct option is C 2
E=13.6n2 eV

En=78.4 kcal mole

1 eV=23.1 kcal mole 1

n2=13.6×23.178.4

n=2

Hence, option C is correct.

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