Question

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 $9$.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (D)

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 $5$.