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

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Which of the following represents the correct order of increasing first ionisation enthalpy for `Ca,Ba,Se`, and `Ar`?
A. `CaltSltBaltSeltAr`
B. `SltSeltCaltBaltAr`
C. `BaltCaltSeltSltAr`
D. `CaltBaltSltSeltAr`
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Correct Answer - C
Order of increasing `DeltaH_(IE_(1)):BaltCaltSeltSltAr`
`BaltCa,SeltS:` On moving top to bottom in a group, size increases. So ionisation energy decreases.
Ar : Maximum value of ionisation energy, since it is an inert gas.
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