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 :
[d] 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 side and brown colour diminishes.
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