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

Element∆H1∆H2∆egH
(i)Most reactive non metalA4193051– 48
(ii)Most reactive metalB16813374– 328
(iii)Least reactive elementC7381451– 40
(iv)Metal forming binary halideD2372525148

(1) (i) – B, (ii) – A, (iii) – D, (iv) – C
(2) (i) – A, (ii) – B, (iii) – D, (iv) – C
(3) (i) – C, (ii) – D, (iii) – B, (iv) – A
(4) (i) – B, (ii) – C, (iii) – A, (iv) – D

Answer: Option 1
Explanation:
Here, △H1 is first ionisation enthalpy and
△H2 is second ionisation enthalpy
and △egH is electron gain enthalpy

(i) Most reactive non-metal has high △H1 and high △H2 and most negative △egH. Therefore , the element is B.
(ii) Most reactive metal has low △H1 and higher △H2 (because the second electron has to be lost from the noble gas configuration) and has small negative △egH. Therefore, the element is A
(iii) Noble gases are the least reactive elements. They have very higher △H1 and △H2 and have positive △egH values. Thus the element is D.
(iv) Metal forming binary halides are halides are alkaline earth metals. They have △H1 and △H2 values little higher than those of most reactive metals (such as A) and have comparatively slightly less negative △egH values. Thus the element is C.

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