4. Which of the following is an acid-base indicator? (a) Vinegar (b) Lime water (c) Phenolphthalein (d) Baking soda
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So, it can be used as an indicator. So, the correct option is B. Note:Phenolphthalein is generally used as an indicator of acid-base titrations. :)
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Answer:
c phenolphthalein
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