MCQ
The compound not soluble in acetic acid is
- A$CaC{O_3}$
- B$CaO$
- ✓$Ca{C_2}{O_4}$
- D$Ca{(OH)_2}$
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| Acid | $HF$ | $HCL$ | $HBr$ | $HI$ |
| $K_a$ | $7.2 \times 10^{-4}$ | $1 \times 10^6$ | $1 \times 10^9$ | $3 \times 10^{11}$ |
Which of these Bronsted acids would have the weakest conjugate base ?


(At. nos. $Ti = 22,\,Cr = 24,$ $ Mn = 25,\,Ni = 28$)