The pink color of phenolphthalein in an alkaline medium is due to:

The best indicator for the detection of the end point in the titration of a strong acid and a weak base is:

$A$ compound '$X$' is a weak acid and it exhibits colour change at $pH$ close to the equivalence point during neutralization of $NaOH$ with $CH_3COOH$. Compound '$X$' exists in ionized form in basic medium. The compound '$X$' is.

For which of the following titrations is phenolphthalein the most suitable indicator?

Given below are two statements :-
Statement $I$ :- Methyl orange is a weak acid.
Statement $II$ :- The benzenoid form of methyl orange is more intense/deeply coloured than the quinonoid form.
In the light of the above statements,choose the most appropriate answer from the options given below :-

Which indicator can be used in the titration of a strong acid and a strong base?