Question

Concentrated nitric acid ,upon long standing, turns yellow brown due to formation of

Answer 1

this happens becoz HNO3 break down to form NO2 which is yellow color on exposure to environment

Answer 2

The change of color of nitric acid upon long standing is due to the decomposition of the acid into nitrogen dioxide.

• When nitric acid is left for long standing, it 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:

$4HNO_3\rightarrow4NO_2+O_2+2H_2O$

Learn more about such concept

Name a colorless gas liberated on decomposition of nitric acid

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Identify the gas evolved in each of the following cases: (i) A colorless gas liberated on decomposition of nitric acid. (ii) Water is added to calcium carbide (iii) Dilute hydrochloric acid is added to Zinc sulphide. (iv) Dilute nitric acid is added to copper.

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