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Which of the following is a measure of the firmness or strength with which an extra electron is bound to the free atom?A. First ionization enthalpyB. Second ionization enthalpyC. Third ionization enthalpyD. Zeroth ionization enthalpy

Answer» Correct Answer - D
Zeroth ionization enthalpy is the energy required to remove an electron from an isolated gaseous anion to form free atom.
`X^(-)(g) rarr X(g) +e^(-)`
It is numerically equal to first electron gain enthalpy.


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