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When a student added red litmus to an aqueous solution, the red litmus turned blue. Which one of the following should be added in excess so that the change in colour is reversed?(1) baking soda solution(2) lime water (3) vinegar solution(4) ammonia solution

Answer» When a student added red litmus to an aqueous solution, the red litmus turned blue. Which one of the following should be added in excess so that the change in colour is reversed?

(1) baking soda solution

(2) lime water

(3) vinegar solution

(4) ammonia solution


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