Consider this chemical reaction of bromothymol blue indicator. It appears yellow in undissociated form and blue in its dissociated aqueous solution. Open image in full-screen view What will be the color of the solution if a large amount of cap h sub 2 CO sub 3 is added?

Adding a large amount of H₂CO₃ makes the solution more acidic by increasing its H⁺ concentration. The added H⁺ shifts the indicator equilibrium toward its undissociated form, which is yellow. Therefore, the solution will remain yellow, choice C.

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