Question

An indicator prepared from red cabbage changes its colour in strong alkali solution to:

• A. green
• B. orange
• C. blue
• D. none of the above

Answer 1

The correct option is A green

Purple cabbage has pigment anthocyanin which can be used as an indicator to identify whether a given substance is acidic or basic.

It changes it's colour to red in acidic medium and changes it's colour to green in basic medium.

Since, alkalis are nothing but water soluble bases, and so the indicator prepared using purple cabbage turns it's colour to green (since the medium is basic in nature).

Hence, the correct answer is option (A).