Acids turn blue litmus paper
- blue
- green
- red
- grey
Show answer and solution
Correct answer: C. red
1. Litmus is a natural acid base indicator.
2. In an acidic solution it changes from blue to red.
3. Bases do the reverse, turning red litmus blue.
_Source: AP/TS SCERT Class 10 Physical Science, "Acids, Bases and Salts"_