ChemistryInorganic: D and F Block Elements

Yellow colour of chromate changes to orange on acidification due to w…

Yellow colour of chromate changes to orange on acidification due to which of the following?

Answer & explanation

Correct answer: option 3

The yellow colored solution of chromate salt changes to orange color on acidification due to the formation of $C r_{2} O_{7}^{2 -}$ . In acidic medium, chromate ion changes to dichromate ion.
$y e l l o w 2 C r O_{4}^{2 -} + 2 H^{+} \to o r a n g e r e d C r_{2} O_{7}^{2 -} + H_{2} O$