Which of the following is a correct match?
Orthoboric acid - HBO2
Metaboric acid - H6B4O7
Pyroboric acid - H3BO3
Tetraboric acid - H2B4O9
HBO2 —Metaboric acid
H3BO3 —Orthoboric acid
H2B4O7 —Tetraboric acid
H6B4O9 —Pyroboric acid