An indicator that turns RED in acidic solution and BLUE in basic solution is:
AMethyl orange
BPhenolphthalein
CLitmus
DUniversal indicator
Answer & Solution
Correct answer: C. Litmus
1. Litmus is the classic red↔blue indicator.
2. Red litmus turns blue in BASE; blue litmus turns red in ACID.
3. Phenolphthalein is colourless in acid, PINK in base.
4. Methyl orange is red in acid and yellow in base.
_Source: NCERT Class 10 Science Ch 2 §2.1.1 Indicators_
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