On adding NaOH solution to the aqueous solution of `K_(2)Cr_(2)O_(7)`, the colour of the solution changes from :
On adding NaOH solution to the aqueous solution of `K_(2)Cr_(2)O_(7)`, the colour of the solution changes from :
A. orange to yellow
B. yellow to orange
C. orange to red
D. yellow to pink.
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