Which indicator turns pink in basic solutions and remains colorless in acidic solutions?
Answer and explanation
Correct answer: A. Phenolphthalein
- Step 1: Phenolphthalein is a synthetic indicator that is colorless in neutral and acidic media.
- Step 2: In alkaline solutions (), it dissociates into its pink conjugate base form.
Answer
Phenolphthalein.
Why not the others: Methyl orange turns red in acid and yellow in base; litmus turns red in acid and blue in base; and turmeric turns reddish-brown in base.
Practise more Chemical Substances - Nature and Behaviour.
Free questions with an explanation for every one, and full timed CBSE Class 10 mock tests.
More Chemical Substances - Nature and Behaviour questions
- Which of the following chemical reactions represents a double displacement and precipitation reaction?
- What chemical compound is formed when chlorine gas is passed through dry slaked lime during industrial production of bleaching powder?
- Which of the following metals does NOT react with either cold water or hot water, but reacts only with steam to produce metal oxide and hydr…
- What is the pH range within which the human body normally functions to maintain physiological homeostasis?
- In the electrolytic refining of copper, what is connected to the positive terminal (anode) of the electrolytic cell?
- Which functional group is present in the organic compound butanone?