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Question

If first ionization potential of an atom is 16 V then determine the first excitation potential value for it.

A
12 V
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B
14 V
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C
19 V
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D
20 V
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Solution

The correct option is A 12 V
First ionisation potential is the amount of energy which supplied to escape electron from the field of the nucleus of the atom.

We can assume this as a transition from 1st orbit n=1 to the infinite orbit n=,

EE1=16eV

But we know that, En1n2,

ie, E1=16eV

and for the first transition/excitation from n=1 to n=2,

required energy will be,

E2E1=1622(16)

E2E1=12eV,

Hence, the correct option is A

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