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InterviewSolution
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Which of the following represents the correct order of increasing first ionisation enthalpy for `Ca,Ba,Se`, and `Ar`?A. `Ca lt S lt Ba lt Se lt Ar`B. `S lt Se lt Ca lt Ba lt Ar`C. `Ba lt Ca lt Se lt S lt Ar`D. `Ca lt Ba lt S lt Se lt Ar` |
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Answer» Correct Answer - C Ionisation energy increases along a period from left to right and decreases down a group. The position of given elements in the periodic table is as ` {:(2,16,18),(Ca,S,Ar),(Ba,Se,):}` Thus, the order of increasing `DeltaHIE_(1)` is `Ba lt Ca lt Se lt S lt Ar`. |
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