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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Application +4 | -1

The formation of

{O}^{2-}(\mathrm{g})

starting from

{O}(\mathrm{g})

is endothermic by

603 \mathrm{~kJ} \mathrm{~mol}^{-1}

. If electron affinity of

{O}(\mathrm{g})

-141 \mathrm{~kJ} \mathrm{~mol}^{-1}

, the second electron affinity of oxygen would be:

View answer and explanation

Correct option: A

+744 \mathrm{~kJ} \mathrm{~mol}^{-1}

Option A (+744 kJ mol⁻¹) is correct because it represents the energy required to add a second electron to O⁻(g), calculated from the overall endothermic formation of O²⁻(g).

JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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