What change will occur to the equilibrium mixture
\( 2CrO^{2-}_4(aq) + 2H^+(aq) ⇔ Cr_2O^{2-}_7(aq) + H_2O(l) \) when excess sodium hydrogen solution is added?

A. A yellow precipitate of Cr(OH)₃ is formed
B. An orange precipitate of Cr(OH)₃ is formed
C. The colour changes from orange to yellow  
D. The colour changes from yellow to orange
E. There is no visible reaction.

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Correct Answer: C