Consider the following indicator and its color in an acidic medium:
| S.No | Indicator | Colour in an acidic medium |
| 1. | Methyl Orange | Yellow |
| 2. | Methyl red | Red |
| 3. | Phenolphthalein | colorless |
| 4. | Litmus | Red |
Which of the above option is correct?
1
One pair only
2
Two pairs only
3
Three pairs only
4
All pairs