Question

Write any four indicators and how they change their colour in an acidic medium?

Answer 1

$\begin{array}{cc}\text{Indicator}& \text{Change in acidic medium}\\ \text{1. Red litmus paper}& \text{Remains colourless [0.5 Marks]}\\ \text{2. Blue litmus paper}& \text{Blue to red [0.5 Marks]}\\ \text{3. Methyl orange}& \text{Orange to red [0.5 Marks]}\\ \text{4. Phenolphthalein}& \text{Remains colourless [0.5 Marks]}\end{array}$