What is the effect of increasing pH on the colour of `K_(2)Cr_(2)O_(7)` solution ?

Explanation

In aqueous solution `:` ` underset("Dichromate ion ( orange red)")(Cr_(2)O_(7)^(2-))+H_(2)O hArr underset("Chromate ion ( yellow)") (2CrO_(4)^(2-))+ 2H^(+)`
In acidic medium (i.e., decreasing pH ) , equilibrium shifts backward and the colour is organe red. In basic medium (i.e., increasin pH ), equilibrium will shift forward and the solution is yellow .