Starch can be used as an indicator for the detection of traces of

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

In an acid-base titration,the rapid change in $pH$ near the equivalence point depends on the indicator used. The $pH$ of the solution is related to the ratio of the concentrations of the conjugate acid $(HIn)$ and base $(In^-)$ forms of the indicator by which equation?

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 :-

The pink colour of phenolphthalein in an alkaline medium is:

The indicator used in the titration of $Na_2CO_3$ with $HCl$ is..................