The correct option is (c).
Explanation
Indicators are substances used to determine the acidic or basic nature of a solution by changing colour. China rose (Hibiscus rosa-sinensis) is a natural indicator extracted from the petals of the flower.
Statement-wise Analysis:
- Statement 1 is Incorrect. The China rose indicator is prepared by keeping the petals in warm water for some time until the water becomes coloured. Warm water facilitates the extraction of the pigment. Ice-cold water is not used for this process.
- Statement 2 is Correct. When the China rose indicator is added to an acidic solution (such as lemon juice or vinegar), the solution turns to a dark pink (magenta) colour.
- Statement 3 is Correct. When the China rose indicator is added to a basic solution (such as baking soda solution or soap water), the solution turns green.
Key Takeaway:
China rose indicator is prepared using warm water. It distinguishes substances by turning acidic solutions dark pink (magenta) and basic solutions green.