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JEE Main202126 Feb 2021Evening ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

The correct order of electron gain enthalpy is:

Options

  1. AS > O > Se > Te
  2. BO > S > Se > Te
  3. CS > Se > Te > O
  4. DTe > Se > S > O

Correct answer

C. S > Se > Te > O

Step-by-step solution

Electron gain enthalpy is the amount of energy released when an element accepts an electron. The process is endothermic. correct order of electron gain enthalpy is O < S > Se > Te ⇒   S > Se > Te > O (Oxygen shows least electron gain enthalpy due to small size of atom)

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