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Q.

Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O?

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a

Al < Ca < O < C < F

b

Al < O < C < Ca < F

c

C < F < O

d

Ca

answer is D.

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Detailed Solution

Electron gain enthalpy becomes less negative from top of bottom in a group while it becomes more negative from left to right within a period.
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