MCQ
Select equations having endothermic step

$(A)\,S_{\left( g \right)}^ - \,\, \to \,\,S_{\left( g \right)}^{2 - }\,$

$(B)\,Na_{\left( g \right)}^ + \, + \,Cl_{\left( g \right)}^ - \,\, \to \,\,NaCl\,(s)$

$(C)\,{N_{\left( g \right)}}\, \to \,\,N_{\left( g \right)}^ - $

$(D)\,Al_{\left( g \right)}^{2 + }\, \to \,\,Al_{\left( g \right)}^{3 + }$

  • A
    $A, B, C$
  • B
    $B, C, D$
  • $A, C, D$
  • D
    $A, B, D$

Answer

Correct option: C.
$A, C, D$
c
$a.$ $S _{( g )}^{-} \rightarrow S _{( g )}^{2-}$ Electron affinity of an anion (endothermic)

$b.$ $Na _{( g )}^{+}+ Cl _{( g )}^{-} \rightarrow NaCl _{( s )}$ Lattice energy (exothermic)

$c.$ $\quad N _{( g )} \rightarrow N _{( g )}^{-}$ (Half filled p-subshell)

$d.$ $Al _{\text {(g) }}^{2+} \rightarrow Al ^{3+}_{( g )}$ (endothermic as ionization is endothermic)

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