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What is the indicator used in this experiment of volumetric analysis and its color change? Select one: O a. Litmus paper, red to blue O

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What is the indicator used in this experiment of volumetric analysis and its color change? Select one: O a. Litmus paper, red to blue O b. Universal indicator, red to blue O c. Phenolphthaleinm, colorless to pink O d. Phenolphthaleinm, pink to colorless O e. Methyl blue, red to blue

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