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CGP EDU Academic Team
Published on: August 12, 2026
Upon long standing, concentrated HNOs
Text Solution
Verified by ExpertsThe correct answer is:
B
When nitric acid is left for long standing, its color changes due to decomposition reaction.The reaction in which one reactant yields two or more products, it is called a decomposition reaction. Due to decomposition, concentrated nitric acid (HNO 3 ) gets broken down to nitrogen dioxide, oxygen, and water. Due to the formation of nitrogen dioxide, it turns yellow-brown. The chemical reaction involved in the reaction is as follows:
4 HNO 3 
4 NO 2 + O 2 + 2 H 2 O
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