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Chemical Reactivity

Which of the ...

Question

Which of the following processes involves absorption of energy?

Cl (g) + e

^{-}

\to

^{-}

(g)

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^{-}

e^{-}

\to

^{2 -}

(g)

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O (g) + e

^{-}

\to

^{-}

(g)

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S (g) + e

^{-}

\to

^{-}

(g)

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Solution

The correct option is B O $^{-}$ + $e^{-}$ $\to$ O $^{2 -}$ (g)
$O^{-}$ to $O^{2 -}$ because of interelectronic repulsion, it will require energy to add an electron to its outermost shell.
Hence option B is correct answer.

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Similar questions

O_{(g)} + e^{-} \to O_{(g)}^{-} Δ H_{1}

O_{(g)}^{-} + e^{-} \to O_{(g)}^{- 2} Δ H_{2}

O_{2 (g)} \to O_{2 (g)}^{+} + e^{-} Δ H_{3}

O_{(g)} \to O_{(g)}^{+} + e^{-} Δ H_{4}

H_{2 (g)} \to H_{2 (g)}^{+} + e^{-} Δ H_{5}

H_{(g)} \to H_{(g)}^{+} + e^{-} Δ H_{6}

O_{(g)} + 2 e^{-} \to O^{- 2} Δ H_{7}

O_{(g)} + e^{-} \to O_{(g)}^{-}, Δ H_{1}

F_{(g)} + e^{-} \to F_{(g)}^{-}, Δ H_{2}

C l_{(g)} + e^{-} \to C l_{(g)}^{-}, Δ H_{3}

O_{(g)}^{-} + e^{-} \to O_{(g)}^{2 -}, Δ H_{4}

For the process $H_{2} O (l) (1 b a r, 373 K) \to H_{2} O (g) (1 b a r, 373 K)$ , the correct set of thermodynamic parameters is

O_{(g)} + e^{-} \to O_{(g)}^{-} Δ H_{1}

O_{(g)}^{-} + e^{-} \to O_{(g)}^{- 2} Δ H_{2}

O_{2 (g)} \to O_{2 (g)}^{+} + e^{-} Δ H_{3}

O_{(g)} \to O_{(g)}^{+} + e^{-} Δ H_{4}

H_{2 (g)} \to H_{2 (g)}^{+} + e^{-} Δ H_{5}

H_{(g)} \to H_{(g)}^{+} + e^{-} Δ H_{6}

O_{(g)} + 2 e^{-} \to O^{- 2} Δ H_{7}

F_{2 (g)} + 2 e^{-} \to 2 F_{(a q)}^{-}; E^{o} = + 2.85 V

{C l}_{2 (g)} + 2 e^{-} \to 2 {C l}_{(a q)}^{-}; E^{o} = + 1.36 V

{B r}_{2 (l)} + 2 e^{-} \to 2 {B r}_{(a q)}^{-}; E^{o} = + 1.06 V

I_{2 (g)} + e^{-} \to 2 I_{(a q)}^{-}; E^{o} = + 0.53 V

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