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.



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