A) 2.0
B) 2.5
C) 3.0
D) 4.0
Correct Answer: A
Solution :
Key Idea: \[p{{K}_{a}}=-\log \,{{K}_{a}}\] \[\therefore \] Higher the value of \[p{{K}_{a}}\], weaker is the acid. Among given choices 2.0, 2.5, 3.0 and 4.0 the value 2.0 is lowest so this acid is strongest.
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