A) Adding Mg powder
B) Boiling the acid
C) Passing \[N{{H}_{3}}\] through acid
D) Passing air through warm acid
Correct Answer: D
Solution :
Nitric acid decomposes to give \[N{{O}_{2}}\] which is brown. \[4HN{{O}_{3}}\to 4N{{O}_{2}}+2{{H}_{2}}O+{{O}_{2}}\] When air is passed through acid the reaction proceeds towards left hand hand side and brown colour diminishes.
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