The incorrect statement for the use of indicators in acid-base titration is :

<style type="text/css"> .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-baqh{text-align:center;vertical-align:top} .tg .tg-amwm{font-weight:bold;text-align:center;vertical-align:top} </style> <table class="tg"> <thead> <tr> <th class="tg-amwm">Indicator</th> <th class="tg-amwm">pH range</th> </tr> </thead> <tbody> <tr> <td class="tg-baqh">Methyl orange</td> <td class="tg-baqh">3.2 - 4.5</td> </tr> <tr> <td class="tg-baqh">Phenolpthalein</td> <td class="tg-baqh">8.3 - 10.5</td> </tr> </tbody> </table> <br/>Option B is the incorrect statement for the use of indicators in acid-base titration. <br/><br/>Methyl orange is a suitable indicator for a strong acid vs strong base titration, not for a weak acid vs weak base titration. In a weak acid vs weak base titration, the pH at the equivalence point is typically around 7, which is within the pH range where methyl orange undergoes a color change. Therefore, methyl orange is not suitable for use in weak acid vs weak base titrations. <br/><br/>The other options are correct: <br/><br/>Phenolphthalein is a suitable indicator for a weak acid vs strong base titration because the pH at the equivalence point is basic, which causes phenolphthalein to undergo a color change. <br/><br/>Methyl orange is a suitable indicator for a strong acid vs weak base titration because the pH at the equivalence point is acidic, which causes methyl orange to undergo a color change. <br/><br/>Phenolphthalein may be used for a strong acid vs strong base titration because the pH at the equivalence point is basic, which causes phenolphthalein to undergo a color change.