P-Block Elements Ques 570
Question: Brown colour in $ HNO_3 $ can be removed by
Options:
A) adding Mg powder.
B) boiling the acid.
C) passing $ NH_3 $ through acid.
D) passing air through warm acid.
Show Answer
Answer:
Correct Answer: D
Solution:
Nitric acid decomposes to give $ NO_2 $ which is brown $ 4HNO_3\to 4NO_2+2H_2O+O_2 $ When air is passed through acid the reaction proceeds towards left hand side and brown colour diminishes.
