Answer :

(a) Test tube A : Color change to RED

Test tube B: No color Change

Test tube C: No color Change

(b) Test tube A: No Color Change

Test tube B: Color change to Blue

Test tube C: No change

(c) Test tube A: Colourless solution

Test tube B: Pink solution

Test tube C: Colorless solution

Tartaric acid(Solution A) is acidic in nature. Soap (solution B)is basic in nature. Pure water (Solution C ) is neutral in nature.

Acid turns blue litmus red, base turns red litmus blue, neutral substances do not change the color of litmus. Phenolphthalein gives pink color with base and colorless solution with acid and neutral substances.

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