Which of the following statement is not correct? a. Ionisation enthalpy for a neutral atom is al...

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Which of the following statement is not correct?
a. Ionisation enthalpy for a neutral atom is always positive
b. \( 2^{\text {nd }} \) I.E. of monovalent cation is equal to the first I.E. of bivalent cation.
c. Ionisation enthalpy of an ion is always positive
d. Both (a) and (b)
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