Question

Which of the following acts as an oxidising as well as reducing agent?

• A. $ N{{a}_{2}}O $
• B. $ N{{a}_{2}}{{O}_{2}} $
• C. $ NaN{{O}_{3}} $
• D. $ NaN{{O}_{2}} $

Answer 1

Answer: (D)

$ NaN{{O}_{2}} $ (sodium nitrite) act both as oxidising as well as reducing agent because in it N-atom is in $ +3 $ oxidation state (intermediate oxidation state).
Oxidising property:
$2NaNO_2 + 2KI + 2H_2SO_4 \to Na_2SO_4$
$ + K_2SO_4 + 2NO + 2H_2O + I_2$
Reducing property :
$H_2O_2 + NaNO_2 \to NaNO_3 + H_2O$