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Endothermic and Exothermic Reaction

Select endoth...

Question

Select endothermic reaction:

S^{-} (g) + e^{-} (g) \to S^{2 -} (g)

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N e (g) + e^{-} (g) \to N e^{-} (g)

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N (g) + e^{-} (g) \to N^{-} (g)

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none of the above

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Solution

The correct options are
B $N e (g) + e^{-} (g) \to N e^{-} (g)$
C $N (g) + e^{-} (g) \to N^{-} (g)$
The following are examples of endothermic reactions. They have a positive value of electron gain enthalpy and energy is absorbed when an electron is added to the atom.
$N e (g) + e^{-} (g) \to N e^{-} (g)$
$N (g) + e^{-} (g) \to N^{-} (g)$
The following is an example of an exothermic reaction. They have a negative value of electron gain enthalpy and energy is released when an electron is added to the atom.
$S^{-} (g) + e^{-} (g) \to S^{2 -} (g)$ .

So, the correct options are $B$ and $C$

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Similar questions

S (g) + e^{-} \to S^{-} (g), Δ H = - 207.6 k J

S (g) + 2 e^{-} \to S^{2 -} (g), Δ H = + 335.2 k J

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