Which terms are exothermic for the formation of NaFs-I- Nag - Na-g - e-II- Fg - e- - F-gIII- Na-g - F-g - NaFs

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Covalent Bond vs Ionic Bond

Which terms a...

Question

Which terms are exothermic for the formation of $N a F (s)$ ?
I. $N a_{(g)} \to N a_{(g)}^{+} + e^{-}$
II. $F_{(g)} + e^{-} \to F_{(g)}^{-}$
III. $N a_{(g)}^{+} + F_{(g)}^{-} \to N a F_{(s)}$

I only

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II only

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I and III only

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II and III only

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N a F (s)

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

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

N a_{(g)}^{+} + F_{(g)}^{-} \to N a F_{(s)}

N a F (s)

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

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

N a_{(g)}^{+} + F_{(g)}^{-} \to N a F_{(s)}

N a (s) \frac{1}{2} {C I}_{2} ⟶ N a C I (s) Δ H = Q

N a (s) ⟶ N a (g) Δ H = S

N a (g) ⟶ {N a}^{+} (g) + e^{-} Δ H = I

\frac{1}{2} {C I}_{2} (g) ⟶ C I (g) Δ H = \frac{D}{2}

C I (g) + e^{-} ⟶ C I^{-} (g) Δ H = ?

{N a}^{+} (g) + {C I}^{-} (g) ⟶ N a C I (s) Δ H = - U

\frac{f}{g}

\frac{g}{f}

(\frac{f}{g}) (\frac{1}{2}), (\frac{g}{f}) (\frac{1}{2})

N a (s) S - ------------ \to Energy of subtimation N a (g)

N a (g) I - ---------- \to Ionisation potenital N a^{+} (g) + e^{-}

C l_{2} (g) D - -------------- \to Bond dissociation energy 2 C l (g)

C l (g) + e^{-} E - --------- \to Electron - affinity C l^{-} (g)

C l^{-} (g) + N a^{+} (g) U - ------- \to Lattice energy N a C l (s)

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