In which of the following process energy is absorbed?

C l + e^{-} ⟶ C l^{-}

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O^{-} + e^{-} ⟶ O^{2 -}

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O + e^{-} ⟶ O^{-}

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N a^{+} + e^{-} ⟶ N a

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Solution

The correct option is B $O^{-} + e^{-} ⟶ O^{2 -}$
$O (g) + e^{-} ⟶ O^{-} (g)$ ; $Δ H = - 142 k J / m o l$
$O^{-} (g) + e ⟶ O^{2 -} (g)$ ; $Δ H = 844 k J / m o l$
In processes $B$ , energy is released.

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Similar questions

Q. Consider the process involving gaseous species,

Process I:

C l + e^{-} \to C l^{-}

Process II:

N a^{+} + e^{-} \to N a

Process III:

S^{-} + e^{-} \to S^{2 -}

Process IV:

K \to K^{+} + e^{-}

The process in which the size of the product is less than reactant:

Given that $2 C l^{-} \to C l_{2} + 2 e^{-}, E^{\circ} = - 1.36 V;$
$H_{2} O \to 2 H^{+} + \frac{1}{2} O_{2} + 2 e^{-}, E^{\circ} = - 1.23 V .$ On electrolysing 1M NaCl solution with inert electrodes, which of the following is correct regarding liberation of electrolytic products ?