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Electronic Configuration

Following are...

Question

Following are the values of the electron affinities of (in $k J m o l^{- 1}$ ) the formation of $O^{-}$ and $O^{2 -}$ from $O$ :

- 142, - 702

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- 142, 702

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142, 702

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- 142, - 142

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Solution

The correct option is B $- 142, 702$
$O (g) + e^{-} \to O^{-} (h)$ $E A = - v e$
$O^{-} (g) + e^{-} \to O^{2 -} (g)$ $E A = + v e$
This is because, existing electron have higher repulsive forces and because of that when $O^{-}$ ion gets electron, it absorb some energy for this process.

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Similar questions

O^{2 -}

O + e^{-} \to O^{-}; Δ H = - 142 k J m o l^{- 1}

O^{-} + e^{-} \to O^{2 -}; Δ H = 844 k J m o l^{- 1}

O^{2 -} (g)

O (g) + e^{-} \to O^{-} (g); Δ H^{0} = - 142 k J m o l^{- 1}

O^{-} (g) + e^{-} \to O^{2 -} (g); Δ H^{0} = 844 k J m o l^{- 1}

O^{2 -} (g)

O_{(g)} + e^{-} = O^{-} (g), Δ H^{0} = - 142 k J m o l^{- 1}

O^{-} (g) + e^{-} = O^{2 -} (g), Δ H^{0} = + 844 k J m o l^{- 1}

^{- 1}

O^{-}

O^{2 -}

O

O^{2 -} (g)

O + e^{-} \to O_{(g)}^{-} + 142 K J m o l e^{- 1}; O^{-} + e^{-} \to O_{(g)}^{- 2} - 844 K J m o l e^{- 1}

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