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High temperature and high pressure (as per Lechatelier principle) favour

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3{O_2}\, \rightleftharpoons \,\,2{O_3},\,\,\,\,\Delta H\,\,\, = \, + {Q_3}

\large {N_2}\, + \,3{H_2}\,\, \rightleftharpoons \,\,2N{H_3},\,\Delta H\, = \, - \,{Q_1}

CaC{O_3}\, \rightleftharpoons \,\,CaO\, + \,C{O_2},\,\,\,\,\Delta H\,\,\, = \, + {Q_2}

{N_2} + {O_2}\, \rightleftharpoons \,\,2NO,\,\,\,\,\Delta H\,\,\, = \, + {Q_4}

answer is C.

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Detailed Solution

\large 3{O_2}\left( g \right) \rightleftharpoons 2{O_3}\left( g \right),\Delta H = + {Q_3}

Formation of ozone is endothermic it is favoured at high temperature.

Formation of ozone involves decrease in volume it is favoured at high pressure.

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