Question

The red cabbage will give pink colour in

• A. Lime water
• B. Vinegar
• C. Milk of Magnesia
• D. Soap

Answer 1

The correct option is B Vinegar

Red cabbage is a visual indicator which changes its colour to pink in acidic medium and to green in basic medium. Vinegar contains acetic acid and lemon contains citric acid. Therefore, these solutions will change the colour of the red cabbage solution to pink.
On the other hand, soap contains sodium hydroxide while lime water contains calcium hydroxide. These are bases and hence, will change the colour of the red cabbage solution to dark green.