A) \[[Ni{{(en)}_{3}}C{{l}_{2}}]C{{l}_{2}}\]
B) \[[Ni{{(N{{H}_{3}})}_{6}}C{{l}_{2}}].\]
C) \[[Ni{{(e{{n}_{3}})}_{6}}C{{l}_{2}}]\]
D) \[Ni\]
Correct Answer: D
Solution :
Electron affinity is defined as the amount of energy released when an electron is added to the outermost shell of gaseous, neutral isolated atom. Electron affinity decrease in a group from top to bottom due to increase in size, so the expected order of EA for halogens is \[{{[{{N}_{2}}{{O}_{5}}]}_{t}}\] But it is not so. It is observed that EA of elements of III period > II period, this is because elements of second period have small size and greater electron density so, the incoming electrons suffer a repulsive force. Thus, the order of EA is \[{{N}_{2}}{{O}_{5}}\]
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