There are only six strong acids, so you might want to commit the list of strong acids to memory. Here they are
 HCl - hydrochloric acid

HNO3 - nitric acid

H2SO4 - sulfuric acid

HBr - hydrobromic acid

HI - hydroiodic acid (also known as hydriodic acid)

HClO4 - perchloric acid

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There are many types of acids -- organic acids, inorganic acids which are further classified into strong acids and weak acids, amino acids (20) in number. There are 6 strong acids, 20 amino acids and innumerable organic acids. It is difficult to ascertain a number.