MCQ
Which of the following compounds we use in our laboratory as a standard solution $($titrant$) \ ?$
- A$\mathrm{KMnO}_4 $
- B$ \mathrm{~K}_2 \mathrm{Cr}_2 \mathrm{O}_7 $
- C$ \mathrm{Na}_2 \mathrm{S}_2 \mathrm{O}_3 $
- ✓All of these
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