What is the correct expression for the equilibrium concentration

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In the equilibrium:2NOCl (g) -> NO (g) Cl2 (g)What is the correct expression for the equilibrium concentration?A) [NOCl] = 1.0-2x [NO] = 2x [Cl2] = xB) [NOCl] = 1.0-x [NO] = x [Cl2] = xC) [NOCl] = [NO] = [Cl2] = x