MCQ
Select equation having exothermic step
  • A
    $S_{\left( g \right)}^ -  \to S_{\left( g \right)}^{ - 2}$
  • $Na_{\left( g \right)}^ +  + Cl_{\left( g \right)}^ -  \to NaC{l_{\left( s \right)}}$
  • C
    ${N_{\left( g \right)}} \to N_{\left( g \right)}^ - $
  • D
    $Al_{\left( g \right)}^{ + 2} \to Al_{\left( g \right)}^{ + 3}$

Answer

Correct option: B.
$Na_{\left( g \right)}^ +  + Cl_{\left( g \right)}^ -  \to NaC{l_{\left( s \right)}}$
b
$Na_{(g)}^ +  + Cl_{(g)}^ -  \to NaCl_{(s)}^ + $ lattice energy (exothermic)

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