The strength of an aqueous

Question:

The strength of an aqueous $\mathrm{NaOH}$ solution is most accurately determined by titrating :

(Note : consider that an appropriate indicator is used)

  1. $\mathrm{Aq} . \mathrm{NaOH}$ in a volumetric flask and concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ in a conical flask

  2. $\mathrm{Aq} . \mathrm{NaOH}$ in a pipette and aqueous oxalic acid in a burette

  3. $\mathrm{Aq} . \mathrm{NaOH}$ in a burette and concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ in a conical flask

  4. $\mathrm{Aq} . \mathrm{NaOH}$ in a burette and aqueous oxalic acid in a conical flask


Correct Option: , 4

Solution:

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