MCQ
The strongest acid is
- A$HA_1\,\,(pK_a = 10)$
- B$HA_2\,\,(K_a = 10^{-4})$
- ✓$HA_3\,\,(pK_a = 2)$
- D$HA_4\,\,(K_a = 10^{-7})$
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$(i)\,Cl\xrightarrow{E.A.}Cl^-\,\,\,\,\,\,(ii)\,C{{l}^{-}}\xrightarrow{I.E.}Cl\,\,\,\,(iii)\,\,Cl\xrightarrow{I.E.}C{{l}^{+}}\,\,\,(iv)\,\,C{{l}^{+}}\xrightarrow{I.E.}Cl^{2+}$
The pair $(s)$ of solutions which form a buffer upon mixing is(are)
$(A)$ $\mathrm{HNO}_3$ and $\mathrm{CH}_3 \mathrm{COOH}$
$(B)$ $\mathrm{KOH}$ and $\mathrm{CH}_3 \mathrm{COONa}$
$(C)$ $\mathrm{HNO}_3$ and $\mathrm{CH}_3 \mathrm{COONa}$
$(D)$ $\mathrm{CH}_3 \mathrm{COOH}$ and $\mathrm{CH}_3 \mathrm{COONa}$
