MCQ
Select the acid with the highest $K_a$ (i.e., lowest $pK_a$).
- A

- ✓

- C

- D






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$2 C ( s )+ H _2( g ) \longrightarrow C _2 H _2( g ) \ \ \ \ \ \Delta H =225 \ kJ mol ^{-1} $
$2 C ( s ) \longrightarrow 2 C ( g )\ \ \ \ \ \ \Delta H =1410 \ kJ mol ^{-1} $
$H _2( g ) \longrightarrow 2 H ( g ) \ \ \ \ \ \ \Delta H =330 \ kJ mol ^{-1}$

