The yellow colour of chromates changes to orange on acidification due to formation of:

The yellow colour of chromates changes to orange on acidification due to the formation of

The yellow coloured solution of chromate salt changes to orange colour on acidification due to the formation of :

When SO_(2) gas is allowed to react with acidified potassium dichromate solution , the yellow colour of the solution changes to green. This is due to the formation of

The yellow colour of autumn levaes is due to

The yellow colour of urine is due to the presence of