For standardizing $NaOH$ solution,which of the following is used as a primary standard?

In the titration of a strong acid and a weak base,the indicator used is:

If $25 \ mL$ of $H_2SO_4$ solution is neutralized by $32.63 \ mL$ of $0.164 \ M \ NaOH$ solution,what is the molarity of the $H_2SO_4$ solution?

In an acid-base titration,$0.1 \ M \ HCl$ solution was added to the $NaOH$ solution of unknown strength. Which of the following correctly shows the change of $pH$ of the titration mixture in this experiment?

The indicator used in the titration of $Na_2CO_3$ with $H_2SO_4$ is

Eosin used to detect the end point of precipitation titration by adsorption is called: