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| अभिक्रिया | $\Delta H \ (kJ)$ |
|---|---|
| $(i) \ 4NH_{3(g)} + 5O_{2(g)} \to 4NO_{(g)} + 6H_2O_{(l)}$ | $-904$ |
| $(ii) \ 2NO_{(g)} + O_{2(g)} \to 2NO_{2(g)}$ | $-112$ |
| $(iii) \ 3NO_{2(g)} + H_2O_{(l)} \to 2HNO_{3(aq)} + NO_{(g)}$ | $-140$ |
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