Hydrogen iodide is dissolved in water. $\text{HI} \rightarrow \text{H}^+ + \text{I}^-$ Which row shows the end colours observed when the solution is tested using damp red litmus paper and acidified aqueous potassium manganate(VII)?
- Ablue; brown
- Bblue; colourless
- Cred; brown
- Dred; colourless