MCQ
Calculate atomic number of $A$ and $B$ respectively


- A$71, 72$
- B$58, 72$
- ✓$57, 72$
- D$57, 71$

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$(I)$ Acetic acid $(II)\, o-$ nitrophenol $(III)\, m-$ nitrophenol $(IV)\, o-$ boric acid
Select correct alternate