Ayaan tested the nature of a few common substances with phenolphthalein indicator and summarised the results in the following table.

Which of the following substances could be present in test tubes 1, 2, 3 and 4?

Answer

C

Explanation

Phenolphthalein remains colourless in acidio solution (lemon juice) and neutral solution (common salt solution). In basic solution (lime water and baking soda), it turns pink.