While titrating a dilute $HCl$ solution with an aqueous $NaOH$ solution,which of the following will not be required?

The strength of an aqueous $NaOH$ solution is most accurately determined by titrating it against a standard solution of oxalic acid. (Note: consider that an appropriate indicator is used)

An aqueous solution of $6.3 \ g$ of oxalic acid dihydrate is made up to $250 \ mL$. The volume of $0.1 \ N \ NaOH$ required to completely neutralise $10 \ mL$ of this solution is.......$mL$

The indicator used during the estimation of $COD$ of a water sample is

Which of the following statements is correct?

Two acids $A$ and $B$ are titrated separately. $25 \ mL$ of $0.5 \ M \ Na_2CO_3$ solution requires $10 \ mL$ of $A$ and $40 \ mL$ of $B$ for complete neutralization. The volumes (in $L$) of $A$ and $B$ required to produce $1 \ L$ of $1 \ N$ acid solution respectively are: