ICSE Class 10 Chemistry 2022 Solved Paper

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State the observation for the following :
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Question : 25
Total: 55
Dry ammonia gas reacts with oxygen in the presence of a catalyst.
Solution:  
Reddish brown vapours of nitrogen dioxide (NO2) are seen in the flask due to the oxidation of nitric oxide (NO).
‌4NH3+5O2
Pt,800∘C
─────▸
6
H2
O
+4‌NO↑+∆
‌2‌NO+O2→2NO2‌ (brown gas) ‌
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