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Which of the following represent the correct order of increasing first ionisation enthalpy for `Ca,Ba,S,Se` and `Ar`

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Which of the following represent the correct order of increasing first ionisation enthalpy for `Ca,Ba,S,Se` and `Ar`
A. `CaltSltBaltSeltAr`
B. `SltSeltCaltBaltAr`
C. `BaltCaltSeltSltAr`
D. `CaltBaltSltSeltAr`
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Correct Answer - C
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