MCQ
Which of the following compound has least $pK_a$ value
- ✓

- B

- C

- D






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| List $I$ (Substances) | List $II$ (Processes |
| $(A)$ Sulphuric acid | $(i)$ Haber's process |
| $(B)$ Steel | $(ii)$ Bessemer's process |
| $(C)$ Sodium hydroxide | $(iii)$ Leblanc process |
| $(D)$ Ammonia | $(iv)$ Contact process |
$X, Y$ and $Z$ can be described as
$PCl _{3}+ H _{2} O \longrightarrow A + HCl$
$A + H _{2} O \longrightarrow B + HCl$
number of ionisable protons present in the product $B\,.....$