In which of the following the energy change corresponds to first ionisation potential?
A
Xg→X+(g)+e
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B
2Xg→2X+(g)+2e
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C
Xs→X+(g)+e
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D
Xag→X+(ag)+e
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Solution
The correct option is AXg→X+(g)+e The energy change for the process Xg→X+g+e−, the energy change corresponds to first ionization potential. It is the minimum amount of energy required to remove an electron from last orbit of an isolated (free) atom in the gaseous state.