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Question
Assertion :For the element O or F, the electron gain enthalpy is less negative than that of the succeeding element. Reason: Electron gain enthalpy becomes less negative as we go down a group.
Assertion :For the element O or F, the electron gain enthalpy is less negative than that of the succeeding element. Reason: Electron gain enthalpy becomes less negative as we go down a group.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Generally, electron gain enthalpy becomes less negative (decreases) as we go down the group because the size of the atom increases and the added electron will be farther from the nucleus. But in case of O or F, the added electron goes to the smaller quantum level i.e., n = 2 and suffers significant repulsion from other electrons present in this level. Electron gain enthalpies (in kJ/mol) for O, S, F and Cl are −141, −200, −328 and −349 respectively
Generally, electron gain enthalpy becomes less negative (decreases) as we go down the group because the size of the atom increases and the added electron will be farther from the nucleus. But in case of O or F, the added electron goes to the smaller quantum level i.e., n = 2 and suffers significant repulsion from other electrons present in this level. Electron gain enthalpies (in kJ/mol) for O, S, F and Cl are −141, −200, −328 and −349 respectively
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