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Which of the following represents correc...

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

A

caltBaltSltSeltAr

B

CaltSltBaltSeltAr

C

SltSeltCaltBaltAr

D

BaltCaltSeltSltAr

Text Solution

Verified by Experts

The correct Answer is:
D
The ionisation enthalpy decreases from top to bottom in a group (i.e., `DeltaiH_(1) Ca gt DeltaiH_(1)Ba, Delta I H_(1)S gt Deltai H_(2)`,Se) and increasing from left to right in a period (I,e. `DeltaiH_(1)S lt Deltai H_(1)` and thus the `DeltaiHI` of the five elements increases in the order : BaltCaltSeltSltAr.
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