MDCAT Chemistry MCQ #5398

A sample of Orthoboric acid (H3BO3) is heated carefully in a crucible to exactly 100 degrees Celsius. What is the resulting product?

MDCAT Chemistry MCQ #5398

  1. Question 1

    Q1. A sample of Orthoboric acid (H3BO3) is heated carefully in a crucible to exactly 100 degrees Celsius. What is the resulting product?

    • A) Boric anhydride
    • B) Tetraboric acid
    • C) Metaboric acid
    • D) Boron carbide

    Answer: Metaboric acid

    Explanation: Orthoboric acid first loses water at 100C to form Metaboric acid; Tetraboric acid is tempting but forms at higher temperatures (140C).