A) \[Ca<Ba<S<Se<Ar\]
B) \[Ca<S<Ba<Se<Ar\]
C) \[S<Se<Ca<Ba<Ar\]
D) \[Ba<Ca<Se<S<Ar\]
Correct Answer: D
Solution :
[d]: lonization enthalpy increases on moving from left to right across the period as the size decreases and decreases on moving top to bottom in a group as the size increases. Ar has the maximum value of I.E., since it is a noble gas. So, the correct order of increasing first ionization enthalpy \[({{\Delta }_{i}}{{H}_{1}})\]is \[Ba<Ca<Se<S<Ar\].
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