Question: why sulfuric acid is a strong acid?
Answer: Sulphuric acid is a strong acid because H2SO4 completely dissociates to H+ and SO42- when it is dissolved in water to form an aqueous solution. It is also diprotic, meaning that there are 2 moles of H+ ions produced for every mol of H2SO4 that dissociates. This gives sulphuric acid a very low pH of about 1.