Question

which of the solutions below is a strong acid?
a) hcn
b) hno₂
c) hf
d) h₂so₄

Explanation:

Strong acids completely dissociate in aqueous solution. HCN, HNO₂, and HF are weak acids that only partially ionize. H₂SO₄ (sulfuric acid) is a well-known strong acid that fully dissociates in its first proton donation, and its second proton also dissociates to a large extent in dilute solutions.

Answer:

d) $\ce{H2SO4}$