Which of the following statements about the compound HCl is true?
The physical and chemical properties of HCl are different from those of H2 and Cl2.
Only the physical properties of HCl are different from those of H2 and Cl2.
Only the chemical properties of HCl are different from those of H2 and Cl2.
The physical and chemical properties of HCl are the same as those of H2 and Cl2.