Final answer:
D) N2 would have a similar rate of effusion to CO at 350 K.
Step-by-step explanation:
The rate of effusion of a gas depends on its molar mass.
According to Graham's law of effusion, the rate of effusion of a gas is inversely proportional to the square root of its molar mass.
In this case, since we are looking for a gas with a similar rate of effusion to CO, we need to find a gas with a similar molar mass to CO.
CO has a molar mass of 28 g/mol.
Among the options given, N2 has the closest molar mass to CO, with a molar mass of 28 g/mol as well. Therefore, N2 would have a similar rate of effusion to CO at 350 K.