Q.

The correct order of electron gain enthalpy is:


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a

Te>Se>S>O  

b

S>Se>Te>O    

c

O>S>Se>Te  

d

S>O>Se>Te  

answer is D.

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Detailed Solution

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Correct order of electron gain enthalpy is S>Se>Te>O   Electron gain enthalpy of oxygen is even less than Te because of inter-electronic repulsion and effective nuclear charge in the oxygen atom.
 
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