Select the equation that represents an exothermic step.

  • A
    $S_{(g)}^{-} \to S_{(g)}^{-2}$
  • B
    $Na_{(g)}^{+} + Cl_{(g)}^{-} \to NaCl_{(s)}$
  • C
    $N_{(g)} \to N_{(g)}^{-}$
  • D
    $Al_{(g)}^{+2} \to Al_{(g)}^{+3}$

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