MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryPeriodic PropertiesPrevious Year Questions
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? (NEET 2013)
A.Al < Ca < O < C < F
B.Al < O < C < Ca < F
C.C < F < O < Al < Ca
D.Ca < Al < C < O < F✓ Correct
Explanation
Electron gain enthalpy becomes less negative from top to bottom in a group while it becomes more negative from left to right within a period. Hence, the correct order of least negative to most negative electron gain enthalpy will be Ca < Al < C < O < F
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