Acidified `K_(2)Cr_(2)O_(7)` on reaction with hydrogen peroxide give deep blue solution due to formation of

Acidified K_(2)Cr_(2)O_(7) turns green by

Acidified K_2Cr_2O_7 changes to green on reactions with

Acidified K_(2)Cr_(2)O_(7) solution turns green when NasO_(3) is added to it. This is due to the formation of :

Acidified K_(2)Cr_(2)O_(7) solution turns green when Na_(2)SO_(3) is added to it. This due to the formation of -

Colour of acidified K_(2)Cr_(2)O_(7) is not changed by: