Question

The indicator used in the titration of a strong acid and a strong base is/are :

• A. phenolphthalein
• B. methyl orange
• C. alizarin yellow
• D. red litmus

Answer 1

Answer: (A), (B)

The correct options are
A phenolphthalein
B methyl orange

Any indicator having $pH$ range between $3.5$ to $10$ will identify the equivalence point. This means that any one of phenolphthalein, methyl orange or bromothylmol blue could be used as an indicator.