10. E
This question combines two concepts. The reaction is exothermic, so think of heat as a product. Increasing the temperature has the same effect as increasing a product’s concentration, so it causes a shift to the left, meaning statement I cannot be in the answer choice. Decreasing the temperature (removing heat) would have the same effect as removing a product (since the reaction is exothermic), so this would cause a shift to the right, and II must be in the correct answer choice. Finally, since all reactants and products are in the gas phase, and there is a total of four moles of gas on the left and a total of two moles of gas on the right, increasing the pressure will push the reaction toward the side with the fewest moles of gas. In this case, the side with the fewer moles of gas is the products side, so this also causes a shift to the right. III is also correct, and answer choice E is correct.
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