Chemistry
Grade-10
Easy
Question
What is the color of red cabbage as an indicator?
- Purple
- Green
- Red
- Pink
Hint:
Red cabbages have anthocyanins.
The correct answer is: Purple
Anthocyanins are a large group of molecules that all have the same basic structure, containing three rings of atoms. Each anthocyanin contains the same core structure which is crucial for absorbing and reflecting light to make a color.
Anthocyanins are responsible for purple color in red cabbages. So the chemical structure and coordination of anthocyanins determine their color. This structure happens to be very sensitive to the acidity of the environment surrounding it. It influences how it organizes the electrons within the molecule.
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