Which of the following reactions is-are exothermic for the formation of N aF s -I- Na g - Na g - e -II- F g - e - F g -III- Na g - F g - NaF s A- I onlyB- II onlyC- I and III onlyD- II and III only

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Covalent Bond vs Ionic Bond

Which of the ...

Question

Which of the following reaction(s) is/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)}

C O_{2}

C H_{3} C H_{2} O H + H C l a n h . Z n C l_{2} - ----- \to

C H_{3} C H_{2} O H + H C l \to

(C H_{3})_{3} C O H + H C l \to

(C H_{3})_{2} C H O H + H C l a n h . Z n C l_{2} - ----- \to

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