Q. 44

Match the correct ionisation enthalpies and electron gain enthalpies of the following elements.


Answer :

(i) Most reactive non metal is B


REASON: It has the highest negative electron gain enthalpy.


(ii) Most reactive metal =A


REASON: It has the lowest negative electron gain enthalpy as well as lowest first ionisation energy.


(iii) Least reactive element=D


REASON:D is the least reactive element as it has an extremely high first and second ionisation enthalpy.


(iv) Metal forming binary halide=C


REASON: it has low first ionisation enthalpy than second but the different is not much.


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