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For the reaction, N2 + 3H2 $⇌$2NH3 in a vessel, after the addition of equal number of mole of N2 and H2, equilibrium state is formed. Which of the following is correct?

(a) [H2] = [N2]                                 (b) [H2] < [N2]

(c) [H2] > [N2]                                 (d) [H2] > [NH3]