Question
Name an indicator which is pink in alkaline solution but turns colourless in acidic solution.
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$\text{Ca(OH)}_2\ +\ \text{CO}_2\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ }\text{CaCO}_3\ +\ \text{H}_2\text{O}$
One H atom of C2H6 is replaced by a COOH group.