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Question
When iron is treated with moderately conc. HNO3, the gas evolved is ______.
Options
H2
NH3
NO
NO2
MCQ
Fill in the Blanks
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Solution
When iron is treated with moderately conc. HNO3, the gas evolved is NO.
Explanation:
When iron reacts with moderately concentrated nitric acid, a redox reaction takes place. Iron is oxidised to Fe3+, and nitric acid is reduced to nitric oxide (NO) gas. This nitric oxide gas is colorless, but it immediately reacts with air to form brown fumes of NO2.
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