Statement I : In the acid – base titration involving strong base and weak acid, methyl red can be used as an indicator.Statement II : Methyl red does not changes its colour in the pH range 4.2 to 6.3.

During an acid-base titration involving a strong base and weak acid, the PH of the system will vary from around 6 to 13. This range of PH should considerably overlap with the color change range of the indicator, then only the indicator will suitable point the end point. Range of PH in which methyl red changes color is 4.4 to 6.2.