MCQ
Among the following acids, the weakest one is
- ✓$HF$
- B$HCl$
- C$HBr$
- D$HI$
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$n$ $l$ $m$

$C{H_3} - \mathop C\limits^{\mathop {||}\limits^O } - O - C{H_2} - \mathop C\limits^{\mathop {||}\limits^O } - C{H_2} - N{H_2}$
$(A)$ All are isoelectronic
$(B)$ All have the same nuclear charge
$(C)$ $\mathrm{O}^{2-}$ has the largest ionic radii
$(D)$ $\mathrm{Mg}^{2+}$ has the smallest ionic radii
Choose the most appropriate answer from the options given below :