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ICSE Class 10 Chemistry 2022 Paper

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State the observation for the following :
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Question : 25 of 55
Marks: +1, -0
Dry ammonia gas reacts with oxygen in the presence of a catalyst.
Solution:  
Reddish brown vapours of nitrogen dioxide (NO2)(\mathrm{NO}_2) are seen in the flask due to the oxidation of nitric oxide (NO).
  4 NH3+5 O2→Pt, 800∘ C6 H2O\;4\,\mathrm{NH}_3+5\,\mathrm{O}_2 \xrightarrow{\mathrm{Pt},\,800^{\circ}\,\mathrm{C}}6\,\mathrm{H}_2\mathrm{O} +4 NO↑+Δ+4\,\mathrm{NO}\uparrow+\Delta
  2 NO+O2→2 NO2  (brown gas)\;2\,\mathrm{NO}+\mathrm{O}_2 \rightarrow 2\,\mathrm{NO}_2 \;\text{(brown gas)}
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