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Select all correct statements dealing with electron affinity. a) In general the first electron affinity is: X(g) → X+(g) + e-b) It is the enthalpy change associated with the addition of an electron to a gaseous atom or ion.c) It is the enthalpy change associated with the removal of an electron from a gaseous atom or ion.d) In general the first electron affinity is: X(g) + e- → X-(g)