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Which of the following represents the co...

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

A

`S lt Se lt Ca lt Ba lt Ar`

B

`Ba lt Ca lt Se lt S lt Ar`

C

`Ca lt Ba lt S lt Se lt Ar`

D

`Ca lt S lt Ba lt Se lt Ar`

Text Solution

Verified by Experts

The correct Answer is:
B
`IE_(1)` increases along the period and decreases sown the group. Moreover Ar is inert gas, has completely filled `bar(e)`'s (Stable structure) hence highest `IE_(1)`.
`underset(((18 gp, 3rd period)))(Ar) gt underset (((16 gp, 3rd period)))(S) gt underset (((16 gp, 4th period)))(Se) gt underset (((2nd gp, 4th period)))(Ca) gt underset(((2nd gp, 6th period)))(Ba)`
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