Final answer:
Among the gases listed, fluorine (F2), chlorine (Cl2), and hydrogen sulfide (H2S) will diffuse more slowly than oxygen because they have higher molar masses according to Graham's law of effusion.
Step-by-step explanation:
The question is about gases that diffuse more slowly than oxygen (O₂). According to Graham's law of effusion, the rate of diffusion of a gas is inversely proportional to the square root of its molar mass. As oxygen has a molar mass of approximately 32 g/mol, gases with higher molar masses will diffuse more slowly than oxygen.
Among the options provided:
F₂ (Fluorine) has a molar mass of about 38 g/mol.
Ne (Neon) has a molar mass of about 20 g/mol.
C₂H₂ (Acetylene) has a molar mass of about 26 g/mol.
NO (Nitric oxide) has a molar mass of about 30 g/mol.
Cl₂ (Chlorine) is listed twice and has a molar mass of about 71 g/mol., H₂S (Hydrogen sulfide) has a molar mass of about 34 g/mol.
Based on this information, fluorine (F₂), chlorine (Cl₂), and hydrogen sulfide (H₂S) are gases that diffuse more slowly than oxygen, because they have higher molar masses.