For gases initially contained in a 1.0 l vessel and the reaction 2 no2(g) ↽⇀ n2o4(g) ∆h◦ = −37.7 kj/mol, which of the following would not cause the equilibrium to shift to the left and convert some n2o4 to no2?
i. addition of 1 mol he(g) to the vessel;
ii. isothermally decreasing the volume of the container to 0.425 l;
iii. addition of 1 mol of n2o4(g);
iv. increasing the temperature;

a. i and iii
b. iv only
c. ii and iv
d. iii only
e. i only
f. ii only
g. i and ii