When Kl is added to acidified solution fo sodium nitrite,

Options

A. `N_(2)` gas is liberated and ` HOI` is produced
B. `N_(2)O` gas is liberated and `I_(2)` is set free
C. ` N_2` gas is liberated and ` HI` is produced
D. ` NO` gas in liberated and ` I_2` is set free

Answer

D

Explanation

Nitrous acid and nitrites are weak oxdizing agents and will oxidize `Fe^(2+)` to `Fe^(3+)` and `I^(-)` to ` I_2`. They themselves are reduced to ` N_2O` or `NO.` ltbgt ` 2I^(-) + 4H^(+)+ 2NO_2^(-) rarr 2NO +I_2+2HO`
However, ` HNO_2` and nitrites are oxidized by ` KMnO_4` and ` Cl_2` forming nitrates , ` NO_3^(-)`.