Question

Which of the following indicator gives pink colour in a basic solution?

• A. Methyl orange
• B. Turmeric
• C. Phenolphthalein
• D. Litmus paper

Answer 1

The correct option is C Phenolphthalein

Indicators are substances that help us to distinguish between an acid and a base through colour change. The following table shows different indicators and their colour in acidic and basic solutions.
$$\begin{array}{ccc}\text{Indicator}& \text{Colour in acidic solution}& \text{Colour in basic solution}\\ \text{Methyl orange}& \text{Pink}& \text{Yellow}\\ \text{Turmeric}& \text{Yellow}& \text{Brownish red}\\ \text{Phenolphthalein}& \text{Colourless}& \text{Pink}\\ \text{Litmus}& \text{Red}& \text{Blue}\end{array}$$
Thus, out of given options, only phenolphthalein gives pink colour in a basic solution.