To us, first-class students, an elderly professor, a chemist, told such a story. At the exam, the student does not pull at all, it is clear that he did not study, but sadly he became a student, gave a chance. He asks:
Tell me what the pH is and I’ll give you 3.
The student thought for a long time. I don’t know the answer, but I need to:
Hydride of phosphorus.! to
The professor put him 3)))