Write any four indicators and how they change their colour in an acidic medium? [2 marks]
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Solution
Indicator Change in acidic medium1. Red litmus paperRemains colourless [0.5 Marks]2. Blue litmus paperBlue to red [0.5 Marks]3. Methyl orangeOrange to red [0.5 Marks]4. PhenolphthaleinRemains colourless [0.5 Marks]