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4)The equilibrium system below shifts right. This could be caused by .
4HCl(g) + O 2 (g) <> 2Cl 2 (g) + 2H2O (g) + energy
A) a decrease in [O 2 ] B) a temperature decrease C) a pressure decreases D) [H 2 O] increases

5) The equilibrium system below shifts left. This could be caused by .
2NO2 (g) + energy <> N2O4 (g)
A) a temperature decreases B) a pressure increases C) [N 2 O 4 ] decreases D) [NO2 ] increases