Which of the following is the strongest acid?

Question

1. HNO2 4. H2SO3
2. H2CO3 5. HFO
3. HC1O3 6. H2O

I'm really stuck, I know none of these are a "strong acid." I think the strongest might be HClO3 because Cl has the highest oxidation number and it has the most amount of oxygen molecules? Please help?

Answer 1

HClO3 is by far the strongest acid of those listed. You could look up the Ka values and eliminate some of them. Just knowing a little chemistry eliminates 1,2,4,and 6.