MCQ
The least stable oxide of nitrogen will be 
  • A
    $2N{O_2}(g)\, \rightleftharpoons \,{N_2}(g)\, + \,2{O_2}(g)\,;\,{{\text{K}}_{{\text{eq}}}}{\text{  =  6}}{\text{.7}} \times {\text{1}}{{\text{0}}^{16}}{\text{ mol}}\,\,{{\text{L}}^{ - 1}}{\text{ }}$
  • B
    $2{N_2}{O_5}(g)\, \rightleftharpoons \,2{N_2}(g)\, + \,5{O_2}(g)\,;\,{{\text{K}}_{{\text{eq}}}}{\text{  =  1}}{\text{.2}} \times {\text{1}}{{\text{0}}^{24}}{\text{ mo}}{{\text{l}}^5}\,\,{{\text{L}}^{ - 5}}{\text{ }}$
  • C
    $2N{O_2}(g)\, \rightleftharpoons \,{N_2}(g)\, + \,{O_2}(g)\,;\,{{\text{K}}_{{\text{eq}}}}{\text{  =  2}}{\text{.2}} \times {\text{1}}{{\text{0}}^{30}}{\text{  }}$
  • $2{N_2}O(g)\, \rightleftharpoons \,2{N_2}(g)\, + \,{O_2}(g)\,;\,{{\text{K}}_{{\text{eq}}}}{\text{  =  3}}{\text{.5}} \times {\text{1}}{{\text{0}}^{33}}{\text{ mol }}{{\text{L}}^{ - 1}}{\text{ }}$

Answer

Correct option: D.
$2{N_2}O(g)\, \rightleftharpoons \,2{N_2}(g)\, + \,{O_2}(g)\,;\,{{\text{K}}_{{\text{eq}}}}{\text{  =  3}}{\text{.5}} \times {\text{1}}{{\text{0}}^{33}}{\text{ mol }}{{\text{L}}^{ - 1}}{\text{ }}$
d
$K_{eq}$ $=$ maximum; max. decomposition

$\therefore \,\,{N_2}O =$ least stable

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