When acids are added to different indicators, some colour changes occur. These colour changes are listed below.
Identify P, Q, R, S and T respectively.
| P | Q | R | S | T | |
| (A) | Colourless | Methyl orange | Blue | Red | Yellow |
| (B) | Colourless | China rose | Blue | Red | Yellow |
| (C) | Pink | Methyl orange | Blue | Red | Reddish-brown |
| (D) | Pink | China rose | Red | Blue | Reddish-brown |