The number of process that are definitely exothermic (Energy is released) out of the following processes are: (i) 2 Cl ( g ) → Cl 2 ( g ) (ii) Na + ( g ) + F ( g ) + e − → NaF ( s ) (iii) Cl ( g ) +

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The number of process that are definitely exothermic (Energy is released) out of the following processes are: (i) 2 Cl ( g ) → Cl 2 ​ ( g ) (ii) Na + ( g ) + F ( g ) + e − → NaF ( s ) (iii) Cl ( g ) + H 2 ​ O + e − → Cl − ( aq ) (iv) Al + 2 ( g ) + e − → Al + 1 ( g ) (v) P ( g ) + e − → P − ( g ) (vi) Ne ( g ) + e − → Ne − ( g ) (vii) A ( s ) → A ( g ) where A is any element (viii) N Θ − e Θ → N

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The number of definitely exothermic processes is 6.

Exothermic processes (6): (i) Bond formation, (ii) Lattice energy release, (iii) Electron gain combined with hydration, (iv) Reverse of second ionization, (v) Electron gain of phosphorus, and (viii) Loss of electron from N⁻ (reverse of nitrogen's endothermic electron gain).

Endothermic processes (2): (vi) Electron addition to a stable noble gas (Ne), and (vii) Sublimation of a solid into gas (

$A (s) \to A (g)$

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