AIIMS2009ChemistryRedox Reactions
Assertion : In an acid-base titration involving strong base and a weak acid, methyl orange can be used as an indicator. Reason : Methyl orange changes its colour in pH range of 7 to 9 .
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion
- BIf both assertion and reason are true but reason is not the correct explanation of assertion
- CIf assertion is true but reason is false
- DIf both assertion and reason are false.
Correct answer
D. If both assertion and reason are false.
Step-by-step solution
In a titration of strong base and weak acid phenolphthalein is used as indicator. Methyl orange changes its colour in pH of range 3 to 5.