Dinitrogen tetraoxide and nitrogen dioxide are two gases that exist in equilibrium at a range of temperatures. NO2 is a reddish brown gas while N2O4 is colorless. If we represent the equilibrium as: N2O4(g) ⇌ 2NO2(g)

We can conclude that:
This reaction is:

a. Exothermic
b. Endothermic
c. Neutral
d. More information is needed to answer this question.

When the temperature is increased the equilibrium constant, K:
a. Increases
b. Decreases
c. Remains the same
d. More information is needed to answer this question.

When the temperature is increased the equilibrium concentration of N2O4:
a. Increases
b. Decreases
c. Remains the same
d. More information is needed to answer this question.